Question

plzz very urgent. ................

Answer 1

Hi ,

Let a , b , c are three sides of the triangular

field ,

a : b : c = 5 : 12 : 13

a = 5x m

b = 12x m

c = 13x m

Perimeter ( P ) = a + b + c

= 5x + 12x + 13x

= 30x --( 1 )

Cost of 1 m fencing = Rs 25

Cost of fencing Perimeter = Rs 2250

i.e ,

30x × Rs 25 = Rs 2250

x = 2250/( 30 × 25 )

x = 3

Therefore ,

a = 5x = 5 × 3 = 15 m

b = 36 m

c = 39 m

We know that ,

15 , 36 , 39 are Pythagorean triplet.

Area of the triangle = ( ab )/2

= ( 15 × 36 )/2

= 15 × 18

= 270 square metres.

Option ( 1 ) is correct.

I hope this helps you.

: )