All sides of a square are increased by 30%, Find the percentage increase in area?
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Step-by-step explanation:
let the side of square be s
area,a = s²
new side s1 = s×(1+30%)=1.3s
new area, a1= s1² =( 1.3s)² =1.69s²
%increase = a1-a/a ×100
=1.69s² -s² /s² ×100
= 0.69s²/s² ×100= 0.69×100
=69%
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