Pre Algebra Scale and Similar Figures

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

• x = 20

• x = 12

• x = 5

• x = 4

∆EFG is similar to ∆HJK. Determine the scale factor of the larger figure to the smaller figure. Take your time!

• 1/3

• 3

• 3 1/3

• 7

Find missing side

• 5

• 7

• 9

• 11

Tell whether the two figures are similar. Explain your reasoning.

• Yes, similar because they are the same shape and side lengths are proportional.

• No, not similar because they are the same shape, but side lengths are not proportional.

• Yes, same shape

• No, different sizes

Shannon is making three different sizes of blankets from the same material. The first measures 2.5 feet by 2 feet. She wants to enlarge it by a scale factor of 2 to make the second blanket. Then she will enlarge the second one by a scale factor of 1.5 to make the third blanket. What are the dimensions of the third blanket?

• 2.5 feet by 2 feet

• 7.5 feet by 6 feet

• 7.5 by 6

• 5 feet by 4 feet

Are these two figures congruent, similar or neither?

• Congruent

• Neither

• Similar

Are these figures similar? Why or why not?

• Yes, their shapes are the same

• No, their corresponding sides are not equal.

• No, their corresponding sides are not proportional.

• Yes, their corresponding sides are proportional

Are the two figures similar?

• yes

• no

Are the two figures similar?

• Yes

• No

Are the following similar? Why or why not?

• Yes

• No, the corresponding angles are not equal.

• No, the ratios of the corresponding sides are not equal.