# Two corresponding sides of two similar triangles are 6cm and 14cm. If the perimeter of the first triangle is 21cm, how do you find the perimeter of the second triangle?

##### 1 Answer

Mar 19, 2016

The perimeter of the second triangle is 49cm

#### Explanation:

because the two triangles are similar their corresponding lengths will be in the same ratio

So

Side 1 divided by side 2 = perimeter 1 divided by perimeter 2

and thus if the unknown perimeter is x then

and

So the perimeter of the second triangle is 49cm