###
right angle

angle that is 90˚

###
acute angle

angle that is less than 90˚

###
obtuse angle

angle that is more than 90˚

###
complementary

two angles that equal 90˚

###
supplementary

two angles that equal 180˚

###
adjacent

angles that are right next to each other

###
transversal

a line that crosses two or more lines

###
corresponding

___________ angles are the same. They are congruent.

###
alternate interior

congruent (hint: ≠)

###
isosceles

a triangle with two equal sides

###
equilateral

a triangle with all equal sides

###
scalene

a triangle with NO equal sides

###
acute

a triangle with all acute angles

###
right

a triangle with a right angle

###
obtuse

a triangle with an obtuse angle

###
quadrilateral

4 sided polygon

###
trapezoid

quadrilateral with one pair of parallel lines

###
parallelogram

quadrilateral with two sets of parallel lines

###
rectangle

parallelogram with 4 right angles

###
rhombus

parallelogram with 4 congruent sides

###
square

parallelogram with 4 congruent sides and 4 right angles

###
polygon

geometric figure with 3 or more line segments that intersect only at their endpoints.

###
regular polygon

polygon with all congruent sides and all congruent angles

###
hexagon

6 sided polygon-720˚

###
heptagon

7 sided polygon-900˚

###
octagon

8 sided polygon-1080˚

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