Question

The sides of a triangle are in ratio 3:4:5.if the perimeter of the triangle is 84cm ,then what is area of the triangle

Answer 1

Step-by-step explanation:

let take 3:4:5: be 3x,4x,5x

perimeter of traingle = sum of all side

84=3x+4x+5x

84=12x

x= 84 /12

x=7.

3x= 7×3= 21

4x=4×7= 28

5x= 5×7=35

Answer 2

Step-by-step explanation:

Let 3:4:5 = 3x + 4x+5x

3x+4x+5x = 84

12x= 84

x= 84/12

x= 7

3x= 3×7=21

4x= 4×7=28

5x= 5×7=35

Area of triangle = 1/2× base × height

Area = 1/2 × 28 × 21

Area = 14×21

Area = 294