Find the area of triangle whose length of sides 15m,17m, 21m(use heron's formula) i
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Let a = 15m, b= 17m c=21m.
s = a + b + c/2
= 15 + 17+21 /2
=53/2
=26.5m
= Area= √s (s-a)(s-b) (s-c)
=√26.5 (26.5-15) (26.5-17) (26.5-21)
= √26.5 (11.5) (9.5) (5.5)
= 0.5 X0.5 26X 11X 9X5
= 0.25 X3√ 26X11X5
= 0.75√1430 m²
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