Geometry Similarity Proportionality

If two triangles are similar, what can be said about their corresponding angles?

• They are complementary

• They are equal

• They are supplementary

• They are right angles

In similar triangles, the ratio of the lengths of corresponding sides is called the:

• Scale factor

• Area ratio

• Perimeter ratio

• Angle ratio

If △ABC ∼ △DEF and AB = 6, AC = 8, and DE = 9, what is the length of DF?

• 12

• 14

• 15

• 16

Which of the following statements is true for similar triangles?

• Their corresponding angles are supplementary

• Their corresponding sides are equal

• Their corresponding angles are equal

• Their corresponding sides are perpendicular

Which of the following is a similarity criterion for triangles?

• SSS (Side-Side-Side)

• SAS (Side-Angle-Side)

• AA (Angle-Angle)

• All of the above

Which of the following pairs of triangles are always similar?

• Equilateral triangles

• Isosceles triangles

• Scalene triangles

• Right triangles

Find side length X.

• 30

• 25

• 15

• 40

If the triangles are similar, state how.

two correct answers

• SSS

• SAS

• Not similar.

If two figures are similar, the corresponding sides are ______________.

• equal

• congruent

• proportional

• none of these

Solve for x

• 20.8

• 63.7

• 27.3

• 21.4