Question

S=150,a=60,b=100,c=140 Root of s(s-a)(s-b)(s-c)

Answer 1

Answer:

3x+5x+7x=300

15x=300

x=20

By using cosine rule to find some angle from the triangle.

let a =3x b=5x c=7x

a=60 b=100 c=140(We need to find the angle between a and b)

c^2=a^2+b^2-2ab cos C ( Find the angle opposite of line c)

19600=3600+10000-[ 2(60)(100) cosC]

-6000= 12000cos C

C=120

By using formula of Side angle side

(ab sin C)/2=(60x100 sin120)/2

=2598.07m^2

Answer 2

Step-by-step explanation:

hope it will help you......