Question

If the sides of triangle measure 13cm cm, 14 cm and 15cm, then the area is​

Answer 1

ans.84 cm

Let a,b,c be the sides of the triangle

Then, s=

2

a+b+c

=

2

13+14+15

=

2

42

=21

Area of triangle =

s(s−a)×(s−b)×(s−c)

=

(21×(21−13)×(21−14)×(21−15)

=

(21×(8)×(7)×(6)

=

(3×7×2×2×2×7×2×3)

=

(3

2

×7

2

×2

2

×2

2

)

By cancelling square and square root we get,

=(3×7×2×2)

=84 cm