Question

Find the missing length

Answer 1

? = 5

Explanation:

Since the figures are similar then the ratios of corresponding sides are equal, that is

`(21)/(7)` =
`(15)/(x)` ( cross- multiply )

21x = 105 ( divide both sides by 21 )

x = 5

That is ? = 5

Answer 2

`The\: missing\: length\: is\: 5`