Angle

formed by two rays that have the same endpoint

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Vertex

the common endpoint of two rays that form an angle

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Point

An exact location in space represented by a dot

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Line

A series of points joined together. It goes forever in both directions.

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Line segment

when both ends of a line have fixed endpoints

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Ray

a line with one fixed endpoint

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parallel lines

lines that never cross and stay the same distance apart

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intersecting lines

lines that pass through the same point and do not make a 90° angle

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perpendicular lines

lines that form square corners/ 90° angle

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degree

unit of angle measurement represented by this symbol

°

polygons

flat closed figures with 3 or more sides; are classified and described by the number of sides

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right angle

a squared corner that measures 90°

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acute angle

•  an angle that measures 1°- 89°

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obtuse angle

an angle that measures

91° - 179°

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equilateral triangle

all sides are the same length

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Right triangle

one angle is a right triangle

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acute triangle

all three angles are acute angles

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obtuse angle

one angle is an obtuse angle

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parallelogram

two pairs of parallel sides

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rectangle

opposite sides equal, 2 pair parallel lines, 4 right angles

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quadrilateral

4 sides, 4 angles that add to 360°

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trapezoid

1 pair of parallel sides; angles vary; could have 2 right angles

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rhombus

4 equal sides; 2 pair parallel sides

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square

4 equal sides, 4 right angles, 2 pair parallel sides; can also be a rectangle and a rhombus

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straight angle

an angle that measures 180° 

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protractor

a tool used to measure angles

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