Question

A rectangle has a width of 5 cm and a length of 10 cm. If the width is increased by 3, how does the perimeter change?

Answer 1

The new perimeter would be 36cm.

Explanation:

The perimeter would change because you add 3 to two sides, because the perimeter originally was 5+5+10+10. Now, it's (5+3)+(5+3)+10+10. Which is 36.

Answer 2

The perimeter changed by 6 cm.

Explanation:

A rectangle has a width of 5 cm and a length of 10 cm.

The perimeter is = 2(length+width)

Perimeter =
`2(10+5)`

=
`2(15)`

= 30 cm

When the width is increased by 3, and lets assume that the length is same .

So, length is 10 cm and width is 8 cm.

Perimeter =
`2(10+8)`

=
`2(18)`

= 36 cm

Change in perimeter =
`36-30=6` cm

So, the perimeter changed by 6 cm.