Question

If these two shapes are similar, what is the measure of the missing length b?

Answer 1

b = 54 cm

Explanation:

We can use proportions if the shapes are similar

Take the same side lengths over each other.

81 cm b cm

----------- = --------------

24 cm 16 cm

Using cross products

81 *16 = 24*b

Divide each side by 24

81*16/24 = 24b/24

54 =b