Triangle Similarity
Ratio
A comparison of two numbers or measurements
Proportion
A ratio that compares different units (ex: miles per hour)
Dilation
A transformation that changes the size of an object, but not the shape
Equilateral Triangle
A triangle with 3 congruent sides and 3 congruent angles.
Acute Triangle
A triangle with all 3 angles less than 90 degrees.
Scalene Triangle
A triangle with no congruent sides.
Obtuse Triangle
A triangle with one angle larger than 90 degrees.
Isosceles Triangle
A triangle with one pair of congruent sides and one pair of congruent angles.
Right angles congruence theorem
All right angles are congruent
AA Similarity
If a pair of triangles have 2 pairs of congruent angles, then the triangles are similar.
3-side Proportionality Similarity
If a pair of triangles have 3 pairs of proportional sides, then the triangles are similar.
Similar Figures
Shapes with congruent angles and proportional sides
Transformation
The movement of a geometric figure
Scale Factor
The whole number or fraction used to multiply the sides of a shape to make a similar image.
Cross Multiply
Use to solve a proportion
Vertical angles theorem
Vertical angles are congruent
