Similar Triangles, Sides, Perimeters, Areas

The pair of figures is similar. Find the missing side.

• x = 20

• x = 12

• x = 5

• x = 4

The pair of figures is similar. Find the missing side.

• x = 10

• x = 4

• x = 2

• x = 5

Triangle PQR is similar to triangle XYZ.  What is the PERIMETER of triangle XYZ?

• 21 cm

• 63 cm

• 105 cm

• 126 cm

Triangle HIJ is similar to triangle STR.  What is the perimeter of triangle STR?

• 32

• 37

• 40

• 42

16) ∆JKL ~ ∆PQR

Which proportion can be used to find x?

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Which statement about the triangles at the right is true?

• ABC is similar to ADF

• ∠BAC is not congruent to ∠DAF

• ABC is congruent to ADF

• ABC is not similar to ADF

The scale factor of two similar figures is 4 : 5. What is the ratio of their perimeters?

• 4 : 5

• 16 : 25

• 64 : 125

• 8 : 10

What is the ratio of the perimeters of the figures?

(Big Shape : Little Shape)

• 5 : 3

• 5 : 2

• 15 : 4

• 10 : 3

Find the ratio of the perimeters of the triangles.

(Small triangle : Big Triangle)

• 4 : 15

• 3 : 5

• 1 : 3

• 1 : 5

Find the ratio of the areas of the triangles.

(Small triangle : Big Triangle)

• 9 : 16

• 9 : 25

• 1 : 9

• 1 : 25