# Question no.46. explain step by step on pen and paper.

By using heron's formula

a=26cm, b=28cm and c=30cm

s=26+28+30/2

s=84/2=42cm

area of triangle=root s(s-a)(s-b)(s-b)

=root 42(42-26)(42-28)(42-30)

=root 42(16)(14)(12)

= 2*2*2*2*3*7

**=336cm**

^{2}

area of parallelogram=height*base

let height of parallelogram be h

area of triangle =area of parallelogram (given)

336=h*28

336/28=h

12cm=h

hope it helps:)