Question

the lengths of sides of a triangle are in the ratio 3:4:7 and its perimeter is 840 cm find its area. please tell me fast I want fast
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Answer 1

Answer:

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Step-by-step explanation:

Answer 2

Answer:

Sides ratio = 3:4:7

let the side be x

Perimeter of Triangle - a+b+c

3x + 4x + 7x = 840

14x = 840

x = 840/14

x = 60

so,

180 cm , 240 cm and 420 cm

We find the area of the triangle by using the herons formula -

= √s(s-a)(s-b)(s-c)

where s = a+b+c/2

-->180 + 240 + 420/2

--> 420

So,

= √420(420- 180)(420-240)(420-420)

= √420(240)(180)(0)

= 4259 cm²