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46 Cards in this Set
- Front
- Back
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acute angle
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An angle of less than 90 degrees.
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Right Angle
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An angle of 90 degrees.
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Obtuse Angle
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An angle of more than 90 degrees.
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Straight Angle
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An angle that measures 180 degrees.
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Angle
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Two rays with a common end point.
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Vertex
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On an angle, the endpoint of the rays forming the angle. (The common endpoints)
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Ray
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Has one endpoint and extends without end in one direction.
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Complementary Angles
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Two angles whose measures add up to 90 degrees.
20 degrees + 70 degrees = 90 degrees 35 degrees + 55 degrees = 90 degrees |
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Supplementary Angles
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Two angles whose measures add up to 180 degrees.
80 degrees + 100 degrees = 180 degrees 35 degrees + 145 degrees = 180 degrees |
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Congruent Angles
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Angles that have equal measures.
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Angle bisector
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A ray bisecting an angle.
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Angle bisector
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A ray bisecting an angle.
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Plane
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A flat surface that extends forever.
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Parallel lines
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Lines in a plane that never meet.
_____________________ _____________________ |
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Transversals
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Lines that intersect two or more parallel lines.
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Perpendicular
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Lines, rays,or line segments that intersect at right angles.
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Quadrilateral
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A 4 sided polygon.
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polygon
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A geometric figure with at least 3 three sides.
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parallelogram
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A quadrilateral with parallel and congruent opposite sides.
Square/Rectangle/Rhombus |
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Rhombuses
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A parallelogram with all sides congruent. (4 congruent sides)
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Trapezoid
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A quadrilateral with only one pair of parallel sides.
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Square
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A quadrilateral with four congruent sides and four right angles.
Also called a parallelogram, rectangle and rhombus. |
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Rectangle
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A quadrilateral that has four right angles.
Also called a parallelogram. |
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Equilateral Triangle
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A triangle whose sides are all the same length.
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Acute Triangle
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A triangle with three acute angles.
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Obtuse Triangle
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A triangle with one obtuse angle (more than 90 degrees and less than 180 degrees).
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Scalene Triangle
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A triangle with no congruent sides.
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Isosceles Triangle
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A triangle with at least two congruent sides.
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Name the three triangles when classified by their sides?
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1. Scalene
2. Isosceles 3. Equilateral |
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Name the four triangles when classified by their angles?
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1. Acute
2. Obtuse 3. Straight 4. Right |
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Pentagon
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A polygon with 5 sides.
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Triangle
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A polygon with three sides.
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Hexagon
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A polygon with 6 sides.
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Heptagon
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A polygon with 7 sides.
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Octogon
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A polygon with 8 sides.
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Decagon
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A polugon with 10 sides.
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Regular Polygon
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All of the sides and all of the angles are congruent.
Examples: square and equilateral triangle |
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What is the formula for finding the sum of the measures of any polygon?
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(Number of sides - 2)x 180 = ____degrees
Example of octagon: (8 sides - 2)x 180 = 1080 degrees |
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Perimeter
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The distance around the outside of a figure.
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Area
What is the formula used to figure out the area of a two-dimentional figure? |
The number of square units to cover the a figure.
Area = base x height |
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Perfect Square
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is the square of a whole number.
Example: 16 = 4² or 49 = 7² |
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Square Root
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The length of the side of a square with an area equal to a given number.
Example: 5 is the square root of 25 |
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What is the formula for anrea of a triangle?
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Area = ½ bh
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Formula for athe area of a Parallelogram.
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Area = bh
**Remember the height isn't always a side. |
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Formula of a Trapezoid.
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Area = ½ h (b1 + b2)
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Who is the best math teacher?
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You are if you take your time and practice.
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