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49 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are intersecting lines?
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If two lines cross, we say that the lines intersect.
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2.A
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What is the point of intersection?
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The point of intersection is the place where two or more lines cross.
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2.A
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What are parallel lines?
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Parallel lines are two or more lines in the same plane that do not intersect.
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2.A
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What are perpendicular lines?
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If two lines make square corners, called right angles, at the point of intersection, we say that the lines are perpendicular.
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2.A
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What are right angles.
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Right angles are the angles made by perpendicular lines and equal 90º.
Right angle = 90º |
2.A
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What is a straight angle?
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A straight angle is formed by two right angles and equals 180º.
A straight angle is the same as a straight line. Straight angle = 180º |
2.A
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What ist an acute angle?
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An acute angle is an angle that is smaller than a right angle, thus is less than 90º.
Acute angle < 90º |
2.A
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What is an obtuse angle.
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An obtuse angle is an angle greater than a right angle and less than a straight angle.
90º < Obtuse angle < 180º |
2.A
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How many degrees does a right angle measure?
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A right angle measures 90 degrees.
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2.A
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How many degrees does a straight angle measure?
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A straight angle measures 180 degrees.
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2.A
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How many right angles make a straight angle?
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Two right angles make a straight angle.
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2.A
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How many connected right angles make a circle and what is the circles measurement?
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Four right angles connect to make a circle.
The measure of a circle is 360 degrees. |
2.A
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Describe a polygon in detail.
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Polygon comes from the Greek:
poly = more than one or many gonon = angle Polygon = more than one angle A polygon is a simple, closed, flat geometric figure whose sides are line segments. 1. simple 2. closed 3. flat or planar 4. line segments - no curves |
2.B
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What are the attributes of a polygon.
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1. Each segment of a polygon is called a side.
2. Each endpoint of a side is called a vertex of the polygon. The plural of vertex is vertices. 3. The number of sides is always equal to the number of vertices in a polygon. |
2.B
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How are polygons named?
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Polygons are named according to the number of sides they have.
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2.B
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What polygon has the least number of sides?
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The triangle is the polygon with the least number of sides.
A polygon, which is a closed, segmented figure, cannot be made with fewer than 3 sides. |
2.B
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What is a polygon with 3 sides?
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A triangle is a polygon with 3 sides.
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2.B
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What is a polygon with 4 sides?
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A quadrilateral is a polygon with 4 sides.
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2.B
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What is a polygon with 5 sides?
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A pentagon is a polygon with 5 sides.
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2.B
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What is a polygon with 6 sides?
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A hexagon is a polygon with 6 sides.
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2.B
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What is a polygon with 7 sides?
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A heptagon is a polygon with 7 sides.
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2.B
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What is a polygon with 8 sides?
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An octagon is a polygon with 8 sides.
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2.B
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What is a polygon with 9 sides?
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A nonagon is a polygon with 9 sides.
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2.B
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What is a polygon with 10 sides?
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A decagon is a polygon with 10 sides.
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2.B
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What is a polygon with 11 sides?
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An undecagon is a polygon with 11 sides.
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2.B
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What is a polygon with 12 sides?
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A dodecagon is a polygon with 12 sides.
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2.B
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What is a polygon with "n" sides?
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A n-gon is a polygon with "n" sides, where "n" = a whole number.
ie. 42-gon is a polygon with 42 sides |
2.B
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List the polygons by name and number of sides.
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triangle = 3 sides
quadrilateral = 4 sides pentagon = 5 sides hexagon = 6 sides heptagon = 7 sides octagon = 8 sides nonagon = 9 sides decagon = 10 sides undecagon = 11 sides dodecagon = 12 sides n-gon = n sides, where n is a whole number |
2.B
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What is a concave polygon?
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A concave polygon is a polygon that has an indentation. (a cave)
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2.B
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What is a convex polygon?
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A convex polygon does not have an indentation.
All non-concave polygons are convex. |
2.B
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What is an equilateral polygon?
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An equilateral polygon is a polygon whose sides all have equal length.
equilateral polygon = all equal sides |
2.B
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What is an equiangular polygon?
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An equiangular polygon is a polygon whose angles all have equal measure.
equiangular polygon = all equal angles |
2.B
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What is a regular polygon?
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A regular polygon is a polygon in which all sides have the same length and all angles have the same measure.
regular polygon = all equal sides and all equal angles |
2.B
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What is the sum of the measures of the three angles in any triangle?
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The sum of the measures of the three angles in any triangle is 180 degrees.
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2.C
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Define a right triangle.
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A right triangle is a triangle that has one right angle, which equals 90º.
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2.C
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Define an acute triangle.
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An acute triangle is a triangle in which all the angles measure less than 90 degrees. ie. all angles are acute.
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2.C
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Define an obtuse triangle.
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An obtuse triangle is a triangle which contains one obtuse angle. ie. greater than 90 degrees.
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2.C
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Define an equiangular triangle.
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An equiangular triangle is a triangle in which the measures of all the angles are equal.
In an equiangular triangle each angle is 60º because 3 x 60º is 180º. Each angle in an equiangular triangle must have a measure of 60 degrees. |
2.C
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Define an isosceles triangle.
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An isosceles triangle is a triangle that has at least two sides of equal length.
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2.C
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Define an equilateral triangle.
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An equilateral triangle is a triangle in which the lengths of all sides are equal.
equilateral triangle = all 3 equal sides |
2.C
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Define a scalene triangle.
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A scalene triangle is a triangle that has no sides of equal length.
scalene triangle = no equal sides |
2.C
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Which triangles get their names based on the types of angles within them?
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1. right triangle
2. acute triangle 3. obtuse triangle 4. equiangular triangle |
2.C
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Which triangles get their names based on the length of their sides?
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1. isosceles triangle
2. equilateral triangle 3. scalene triangle |
2.C
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What are five types of quadrilaterals?
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Five types of quadrilaterals are:
1.Parallelogram 2.Trapezoid 3. Rectangle 4. Rhombus 5. Square |
2.D
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Define a parallelogram.
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A parallelogram is a quadrilateral that has two pairs of parallel sides.
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2.D
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Define a trapezoid.
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A trapezoid is a quadrilateral that has exactly two parallel sides.
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2.D
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Define a rectangle.
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A rectangle is a parallelogram with four right angles.
A square is a special parallelogram. |
2.D
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Define a rhombus.
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A rhombus is an equilateral parallelogram.
A square is a special rhombus. |
2.D
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Define a square.
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A square has 4 equal sides and 4 equal angles.
A square is a rectangle with four equal sides. A square is a rhombus with four right angles. |
2.D
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