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rhombus

A parallelogram with all sides the same length

rectangle

a parallelogram with four right angles

isosceles triangle

a triangle with two equal sides

parallelogram

A quadrilateral with two pairs of parallel sides

trapezoid

a quadrilateral with exactly one pair of parallel sides

square

A rectangle with all sides the same length.

vertex

The common endpoint of an angle

hexagon

a six-sided polygon

obtuse triangle

a triangle with one obtuse angle

right triangle

a triangle with one right angle

scalene triangle

a triangle with no two sides of equal length

equilateral triangle

a triangle with three equal sides

octagon

a polygon with eight sides

quadrilateral

A polygon with 4 sides

triangle

a three-sided polygon

pentagon

a polygon with 5 sides

regular polygon

a polygon with all sides and all angles equal

polygon

A closed plane figure made up of line segments

degrees

a unit for measuring angles

protractor

an instrument for drawing/measuring angles

straight angle

an angle that measures 180 degrees

obtuse angle

An angle more than 90 degrees

right angle

an angle that measures 90 degrees

angle

two rays with a common endpoint

acute angle

An angle less than 90 degrees

plane

An endless flat surface

line segment

part of a line with two endpoints

point

An exact location in space

intersecting lines

lines that cross at one point

ray

Part of a line that has one endpoint and extends forever in one direction.

line

A straight path of points that goes on forever in two directions

perpendicular lines

Two lines that intersect to form right angles

parallel lines

Lines in the same plane that do not intersect

acute triangle

a triangle with 3 acute angles