Posted by Khusbu on Saturday, June 28, 2014 at 4:08am.
If d length n breath of a rectangle r increased by 10% then by wt %wiil the area increase?

math  MathMate, Saturday, June 28, 2014 at 5:53am
If the shapes are similar, area increase as the square of the ratio of the lengths.
In this case, the shape remains the same,
so
old area = d*n
new area = (1.1d)(1.1n)
= (1.1)² dn
= (1.1)² old area
Percentage increase in area
= 1.1²1
= 21%