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obtuse angle

An angle greater than 90 degrees

line

A straight path of point that goes on and on in two directions

angle

An angle is a figure formed by two rays that have the same point

parallel lines

In a plane, lines that never intersect

perpendicular lines

Two intersecting lines that form a right angle

1 ray

A ray is part of a line that has one end point

acute angle

An acute angle is smaller than a right angle

point

A point is a an exact location in space

polygon

Closed place figure made up of line segments

line segment

A part of a line with two end points

pentagon

5 sided figure

acute triangle

An acute triangle has three acute angles

equilateral triangle

triangle with three equal sides

Isosceles triangle

triangle with two equal sides

Intersecting lines

lines that cross at one point

Quadrilateral

a four sided polygon

octagon

an eight sided polygon

hexagon

a six sided polygon

side

each line segment is a side

right angle

a right angle is a 90 degree angle

straight angle

an angle that is a straight line, 180 degrees

triangle

a three sided polygon

vertex

where two sides meet

plane

an endless flat surface