- identical in form
- congruent
- corresponding sides proportional, angles congruent
- similar
- a figure with at least three straight sides and angles
- polygon
- to cut into two equal parts
- bisect
- a point on the line that divides the line into two equal segments
- midpoint
- an angle less than 90 degrees but more than 0
- acute
- an angle more than 90 degrees but less than 180
- obtuse
- a 90 degree angle
- right
- a triangle where all sides and angles are equal
- equilateral
- opposite side divided by hypotenuse
- sine
- adjacent side divided by hypotenuse
- cosine
- opposite side divided by adjacent side
- tangent
- the distance around a circle
- circumference
- a line with a single endpoint that extends infinitely in one direction
- ray
- lines in a plane that never intersect or touch each other
- parallel
- a line that meets another line at a right angle
- perpendicular
- a transformation that turns a figure about a fixed point
- rotation
- a transformation that produces an image the same shape as the original, but a different size
- dilation
- angles that add up to equal 180 degrees
- supplementary
- angles that add up to equal 90 degrees
- complementary

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