Question

IF EACH SIDE OF A TRIANGLE IS INCREASED BY 4cm the ratio of the perimeters of the new TRIANGLE and given triangle is 7:5.Find the perimeter of the given triangle.

Answer 1

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Answer 2

Let the sides be a, b, c

Original perimeter= a+b+c =x

When length of sides are increased by 4cm,

Length of sides are a+4,b+4,c+4

So, new perimeter =a+4+b+4+c+4=a+b+c+12 =x+12

According to the question,

x+12/x=7/5

5(x+12)=7x

5x+60=7x

7x-5x=60

2x=60

x=60/2

.•. x=30 cm

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