Question

What will be increase in area of an equilateral triangle if its side is increased by 20%?
(a) 20%
(b) 33%
(C) 40%
(d) 44%​

Answer 1

d) 44%

Area of equilateral triangle

=√3/4a^2

=√3/4(120a)^2 − √3/4(100a)^2

=√3/4(a)^2 (120^2−100^2)

Ans is 44%

hope it helps..