The side of a square is 10 cm. What is the increase in area in percentage if the side is lengthened by 3 cm.

Question

asked Nov 21, 2021 97.7k views

1 Answer

Jonathan Campbell · Answer 1 · 2021-11-27T17:12:00+0000

Answer: 69%

Explanation:

10 cm

Find the area.
A=s^2

$A=(10cm)^2\\A=100cm^2$

Now calculate the area when a side is lengthened by 3 cm.

10+3=13 cm

$A=s^2\\A=(13cm)^2\\A=169cm^2$

Now calculate the difference.

169-100=69

Divide it by the original number (100) and multiply by 100

(69)/(100)*100=69

This is the increase.