Question

find the area of where sides are 13m,14m and 15m by using heron formula

Answer 1

α =13 cm , в = 14 cm and ¢ = 15 cm.
∴ ѕ = (a + b + c )/ 2 
ѕ = (13 + 14 + 15) / 2 = 21 cm.
ву нєяσиѕ fσямυℓα  √ѕ(ѕ-α)(ѕ-в)(ѕ-¢) σкαу

αяєα = √( 21 x 8 x 7 x 6 )

αяєα = √ ( 7 x 3 x 4 x 2 x 7 x 2 x 3 )

αяєα = √ ( 72x 22 x 22 x 32)

αяєα = 7 x 2 x 2 x 3 

αяєα = 84 cm2 ιѕ яут αиѕωєя

Answer 2

By herons formula:-

Let, a=13m
b=14m
c=15m

then,
s=a+b+c/2
13+14+15/2
42/2
21

area of the triangle=√s(s-a)(s-b)(s-c)
√21(21-13)(21-14)(21-15)
√21*8*7*6
√7056
84m²