Geometry flash cards for my math class. (In my examples, this sign: < is supposed to be an angle sign)

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Supplementary angles

Two angles whose sum is 180 degrees.

EX: <ACB + <BCD = 60 + 120 = 180 degrees.

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Complementary angles

Two angles whose sum is 90 degrees.

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Acute angle

An angle less than 90 degrees but more than 0 degrees.

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Point

An exact location in space.

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Obtuse angle

An angle whose measure is greater than 90 degrees, but less than 180 degrees.

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Line

A straight path that extends without end in opposite directions.

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Right angle

An angle that measures 90 degrees.

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Ray

(mathematics) a straight line extending from a point

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Plane

(mathematics) an unbounded two-dimensional shape

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Vertical angles

a pair of opposite congruent angles formed by intersecting lines

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Parallel lines

coplanar lines that do not intersect

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Perpendicular lines

Two lines that intersect to form right angles

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Acute Triangle

a triangle whose interior angles are all acute

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Obtuse Triangle

a triangle with one obtuse angle

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Equilateral triangle

a triangle with three congruent sides

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Isosceles triangle

a triangle with two congruent sides

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Scalene triangle

a triangle with no two sides of equal length

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