Question

The perimeters of a square and an equilateral triangle are equal. if the diagonal of the square is 9 cm, what is the area of the equilateral triangle?

Answer 1

diagonal=9cm
 we know that, 
2 side squared= diagonal square
2s^2= 9
s^2=4.5
s=2.12approx
perimeter of square= 2.12*4
                               = 8.48cm
side of an eqiulateral triangle= 8.48/3
area of an equilateral triangle is root3/4 s square
                                              root3/4*8.48/3*8.48/3(this is ur answer