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34 Cards in this Set
- Front
- Back
EQUILATERAL
TRIANGLE |
An equilateral triangle is a triangle with all sides congruent.
In the diagram, ΔABC is an equilateral triangle because all the sides measure 2 inches. |
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ISOSCELES
TRIANGLE |
An isosceles triangle is a triangle with at least two sides of the same length.
In the diagram, ΔQRS is an isosceles triangle because sides QR and RS both equal 8cm. |
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VERTICAL
ANGLES |
Vertical angles are angles that are opposite each other when two lines intersect. Vertical angles are congruent.
In the diagram, ∠1 and ∠2 are vertical angles. ∠3 and ∠4 are also vertical angles. |
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CONGRUENT
|
Congruent means to have the same measure.
In the diagram, ∠1 and ∠2 are congruent because they both measure 50°. |
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SCALENE
TRIANGLE |
A scalene triangle is a triangle whose 3 sides all have different lengths.
In the diagram, ΔABC is a scalene triangle because each side is a different length. |
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ACUTE
ANGLE |
An acute angle is an angle whose measure is between 0° and 90°.
In the diagram, ∠1 is an acute angle because it measures 50°. 0° < 50° < 90°. |
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ACUTE
TRIANGLE |
An acute triangle is a triangle with 3 acute angles.
In the diagram, ∆CDE is an acute triangle because it contains 3 acute angles. |
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OBTUSE
ANGLE |
An obtuse angle is an angle whose measure is between 90° and 180°.
In the diagram, ∠XYZ is an obtuse angle because it measures 130°. 90° < 130° < 180°. |
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RIGHT
ANGLE |
A right angle is an angle whose measure is 90°.
In the diagram, ∠TUV is a right angle because it measures 90°. |
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OBTUSE
TRIANGLE |
An obtuse triangle is a triangle with one obtuse angle.
In the diagram, ∆EFG is an obtuse triangle because angle F is an obtuse angle. |
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SUPPLEMENTARY
ANGLES |
Supplementary angles are two angles whose measures have a sum of 180°.
In the diagram, ∠1 and ∠2 are supplementary angles because 110° + 70° = 180°. |
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COMPLEMENTARY
ANGLES |
Complementary angles are two angles whose measures have a sum of 90°.
In the diagram, ∠1 and ∠2 are complementary angles because 40° + 50° = 90°. |
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ADJACENT
ANGLES |
Adjacent angles are two angles in the same plane that share a vertex and a common side, but do not overlap.
In the diagram, ∠3 and ∠4 are adjacent angles. |
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RIGHT
TRIANGLE |
A right triangle is a triangle with one right angle.
In the diagram, ∆QRS is a right triangle because ∠R is a right angle. |
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VERTEX
|
A vertex is a point where the sides of an angle meet.
In the diagram, ∠ABC's vertex is point B. |
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PARALLEL
|
Parallel lines are lines in the same plane that do not intersect.
In the diagram, line r and line s are parallel lines because they do not intersect. |
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QUADRILATERAL
|
A quadrilateral is a polygon (a closed plane figure bounded by line segments) with 4 sides.
In the diagram, □DEFG is a quadrilateral because it is a 4-sided polygon. |
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RECTANGLE
|
A rectangle is a parallelogram that has 4 right angles.
In the diagram, rectangle PQRS is shown. It has 4 right angles. |
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RADIUS
|
The radius of a circle is the distance between a point on a circle and its center.
In the diagram, the circle's radius is segment CD. The radius measures 4cm. |
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PARALLELOGRAM
|
A parallelogram is a quadrilateral whose opposite sides are parallel.
In the diagram, □HIJK is a parallelogram because opposite sides are parallel. Segment HI is parallel to segment JK and segment HK is parallel to segment IJ. |
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SQUARE
|
A square is a rectangle with all sides the same length.
In the diagram, square ABCD is shown. It has 4 right angles and 4 congruent sides. |
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CIRCUMFERENCE
|
The circumference of a circle is the distance around a circle.
In the diagram, the arrows indicate the circumference of circle P. |
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CIRCUMFERENCE
OF A CIRCLE |
The circumference of a circle is found by multiplying ∏ (3.14) by the diameter (d).
The formula for the circumference of a circle is: C = ∏(d) Below, is an example of finding the circumference of circle P. |
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DIAMETER
|
The diameter is the distance across a circle through its center.
In the diagram, the circle's diameter is segment AB. The diameter measures 6cm. |
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PI (∏)
|
PI (∏) is the number that is the ratio of the circumference of a circle to its diameter. Commonly used approximations for ∏ are 3.14 and 22/7.
PI (∏) is used in many different formulas such as these: Area of a circle = ∏r² Circumference of a circle = ∏d Volume of a Cylinder = ∏r²h |
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CIRCLE
|
A circle is the set of all points in a plane that are an equal distance from a given point, the center.
In the diagram, point P is the center of the circle. |
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AREA
OF A CIRCLE |
The area of a circle is the measure of how much surface is covered by the circle. Area is measured in square units.
The area of a circle is found by taking ∏ (3.14) multiplied by the radius (r) squared. The formula for the area of a circle is: A = ∏r². Below is an example of finding the area of a circle. |
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AREA
OF A TRIANGLE |
The area of a triangle is the measure of how much surface is covered by the triangle. Area is measured in square units.
The area of a triangle is found by taking one-half multiplied by the base (b) multiplied by the height (h). The formula for the area of a triangle is: A = ½bh. Below is an example of finding the area of a triangle: |
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AREA
OF A SQUARE |
The area of a square is the measure of how much surface is covered by the square. Area is measured in square units.
The area of a square is found by squaring a side length (s). The formula for the area of a square is: A = s². Below is an example of finding the area of a square: |
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AREA
OF A RECTANGLE |
The area of a rectangle is the measure of how much surface is covered by the rectangle. Area is measured in square units.
The area of a rectangle is found by multiplying the length (l) by the width (w). The formula for the area of a rectangle is: A = lw. Below is an example of finding the area of a rectangle: |
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VOLUME
OF A TRIANGULAR PRISM |
The volume of a triangular prism is the measure of the amount of space the solid occupies. Volume is measured in cubic units.
The volume of a triangular prism is found by multiplying the area of the base (B: ½bh) by the height (h). The formula for the volume of a triangular prism is: V = Bh or V = ½bh(h) Below is an example of finding the volume of a triangular prism: |
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VOLUME
OF A CYLINDER |
The volume of a cylinder is the measure of the amount of space the solid occupies. Volume is measured in cubic units.
The volume of a cylinder is found by multiplying the area of the base (B: ∏r²) by the height (h). The formula for the volume of a cylinder is: V = Bh or V = ∏r²h Below is an example of finding the volume of a cylinder: |
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VOLUME
OF A RECTANGULAR PRISM |
The volume of a rectangular prism is the measure of the amount of space the solid occupies. Volume is measured in cubic units.
The volume of a rectangular prism is found by multiplying the area of the base (B: lw) by the height (h). The formula for the volume of a rectangular prism is: V = Bh or V = lw(h) Below is an example of finding the volume of a rectangular prism: |
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GEOMETRY
FLASHCARDS Devyn Pritchard May 1, 2008 Period 1 |
The purpose of these flashcards is to help a student study basic geometry terms and formulas.
On the front of the flashcard is the term, and on the back of the flashcard is the definition and/or formula with a diagram. HAPPY STUDYING!! |