Question

Answer this question plssssss......

Answer 1

Let the sides be 3x,4x and 5x.
A.T.Q.
$3x + 4x + 5x = 144$
On solving it , we get
$x = 12m$
Now , let s = semiperimeter of the field and sides will be 36 , 48 and 60.
By heron's formula,
$area \: of \: triangle = \sqrt{s(s - a)(s - b)(s - c)} \\ = \sqrt{72(36)(24)(12)} \\ = \sqrt{746496} \\ = 864m^{2}$
Hence, answer is (A).