Question

you have an equilateral triangle of 14m each what is area of the triangle (heron's formula)

Answer 1

Hi,

Side=14m
s=perimeter/2
s=42/2=21
By heron's formula,
under root s×(s-a)(s-b)(s-c)

under root 21×7×7×7

====49×under root 3

Answer 2

$semi \: perimeter \: \frac{14 + 14 + 14}{2} \\ \frac{42}{2 } \\ 21m$

$herons \: formula \: \sqrt{21 \times (7\times 3)} \\ \sqrt{21 - 21}$

49√3