###
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

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