Question

pls answer ....I'll mark the best answer as brainliest

Answer 1

I hope this will help you I have used heron's formula

Answer 2

Given: Ratio of sides is 3:5:7 and perimeter is 300m

To find: Area

Let us take the sides as 3x, 5x and 7x

3x + 5x + 7x = 300m

15x = 300m

x = 300/15

x = 20

Therefore the sides are:

3*20 = 60m

5*20 = 100m

7*20 =  140m

Since three sides are given, we will use Heron's Formula

Heron's Formula = √s(s - a)(s - b)(s - c)

a = 60m

b = 100m

c = 140m

Semi Perimeter (s) = a + b + c/2

= 60 + 100 + 140/2

= 300/2

= 150

s - a = 150 - 60 = 90

s - b = 150 - 100 = 50

s - c =  150 - 140 = 10

Heron's Formula = √s(s - a)(s - b)(s - c)

= √150*90*50*10

= 3*5*10*3*3*10*5*10*10

= 3*5*10*10√3

= 1500√3m²

Hope it helps :)