Question

The lengths of the sides of a triangle are in the ratio 3:4:5. Find the area of the triangle if its perimeter is 144 cm.

Answer 1

Hey friend here is your answer..

let the side 3x, 4x and 5x be Perimeter of the triangle = sum of all sides

144 = 3x + 4x +5x

144 = 12x

x = 12 cm

1st side be 3 * 12 = 36 cm
2nd side be 4 * 12 = 48cm
3rd side be 5 * 12 = 60 cm

s = 36 + 48 + 60/2
= 89

and done by the formula = √ s (- a) (s-b) ( s-c)


hope u can understand....

Answer 2

the sides of a square=3:4:5.

                                     3x+4x+5x=144

3x+4x+5x=144

12x=144

x=144by12

x=1by1

therefore-------3x=3*1=3

                        4x=4*1=4

                        5x=5*1=5