- They add up to a whole of some kind, add up to 90 degrees.
- Complementary
- Two angles that add up to 180 degrees.
- Supplementary
- Having the same shape; having corresponding sides proportional and corresponding angles equal
- Similar
- Same size shape, measure, length etc.
- Congruent
- A pair of adjacent supplementary angles.
- Linear pair
- A transformation that produces the same shape as the original but is a different size.
- Dilation
- A number that scales or multiplies some quantity.
- Scale Factor
- Deals with the relations of sides and angles of triangles.
- Trigonometry
- opposite over hypotenuse
- Sine
- Adjacent over hypotenuse
- Cosine
- Opposite over adjacent.
- Tangent
- Corresponding in size
- Proportional
- Between two similar figures is the ratio of any pair of corresponding sides.
- Similarity Ratio
- (of a line) intersecting a system of lines.
- Transversal
- (of a triangle) having two sides of equal length.
- Isosceles
- having all of its sides of the same length in a triangle.
- Equilateral
- the longest side of a right triangle, it is opposite of the right angle.
- Hypotenuse
- It meets or crosses at right angles.
- Perpendicular
- It cuts an object into two equal parts, is applied to angles and line segments.
- Bisector
- A point on a line segment that divides it into two equal parts,the halfway point of a line segment
- Midpoint
- A quadrilateral with both pairs of opposite sides parallel.
- Parallelogram

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