If the sides of an equilateral triangle is decreased by 20%, its area is decreased by |
|||||||
(a) |
36% |
(b) |
40% |
(c) |
60% |
(d) |
64% |
If the sides of an equilateral triangle is decreased by 20%, its area is decreased by |
|||||||
(a) |
36% |
(b) |
40% |
(c) |
60% |
(d) |
64% |
Let the sides be and 80% of
=
Initial area =
Final area = .
Decrease in area =
Decrease % =