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A parallelogram with all sides the same length


a parallelogram with four right angles

isosceles triangle

a triangle with two equal sides


A quadrilateral with two pairs of parallel sides


a quadrilateral with exactly one pair of parallel sides


A rectangle with all sides the same length.


The common endpoint of an angle


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


a polygon with eight sides


A polygon with 4 sides


a three-sided polygon


a polygon with 5 sides

regular polygon

a polygon with all sides and all angles equal


A closed plane figure made up of line segments


a unit for measuring angles


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


two rays with a common endpoint

acute angle

An angle less than 90 degrees


An endless flat surface

line segment

part of a line with two endpoints


An exact location in space

intersecting lines

lines that cross at one point


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


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

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