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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.
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.
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.
CONGRUENT
Congruent means to have the same measure.


In the diagram, ∠1 and ∠2 are congruent because they both measure 50°.
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.
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°.
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.
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°.
RIGHT
ANGLE
A right angle is an angle whose measure is 90°.

In the diagram, ∠TUV is a right angle because it measures 90°.
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.
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°.
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°.
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.
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.
VERTEX
A vertex is a point where the sides of an angle meet.


In the diagram, ∠ABC's vertex is point B.
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.
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.
RECTANGLE
A rectangle is a parallelogram that has 4 right angles.

In the diagram, rectangle PQRS is shown. It has 4 right angles.
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.
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.
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.
CIRCUMFERENCE
The circumference of a circle is the distance around a circle.

In the diagram, the arrows indicate the circumference of circle P.
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.
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.
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
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.
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.
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:
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:
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:
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:
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:
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:
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!!