Question

Length of edges in A: length of edges in B = 3:5

The perimeter of A is 345 mm
Work out the perimeter of B in mm.

Answer 1

575 mm

Explanation:

The ratio of perimeters is the same as the ratio of sides.

let x be the perimeter of B then by proportion

`(3)/(345)` =
`(5)/(x)` ( cross- multiply )

3x = 1725 ( divide both sides by 3 )

x = 575

Then the perimeter of B is 575 mm