Proportion in Triangles

The triangles are similar, solve for the question mark.

• 8

• 12.5

• 18

• 24

Complete the proportion.
CB / DM  =  AC / ?

• BM

• MA

• BC

• AD

• A
• B
• C
• D

• 2
• 10
• 12
• 15

Complete the proportion.
AB / BM  =  ? / CD

• BC

• AC

• MD

• MC

Are these triangles similar?

• Yes

• No

These two triangles are similar.  Which proportion would find the value of b?

• 6/65 = 8/52

• 8/52 = 10/b

• 10/6 = 52/b

• 6/b = 8/52

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

• Yes, similar because they are the same shape and the sides have a scale factor.

• No, not similar because they are the same shape, but side lengths have no scale factor.

• Yes, same shape

• No, different sizes

Click to see image.

• A

• B

• C

• D

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

• x = 20

• x = 12

• x = 5

• x = 4