Question

the sides of a triangular plot are in the ratio of 3:5:7and its perimeter is 300m.find its area

Answer 1

hye

The sides of a triangular plot are in the ratio of 3:5:7
let it be 3x ,5x and 7x 

perimeter = 300 
perimeter of traingle = 1side+2side+3side
                                   =3x+5x+7x 
                              =15x
300 /15=  20

x= 20 

now substitute 3x ,5x and 7x
so it is 60 , 100 and 140[these are sides].i gave the sides.so find out the area

area is height *base/2..........

Answer 2

Side of triangular plot in ratio= 3:5:7
Let the common multiple be x
So, let the side be 3x, 5x and 7x
and Perimeter= 300m
so 300 = 3x+5x+7x
300 = 15x
x =300/15
x = 20
so sides are 3*20=60, 5*20=100 and 7*20=140m
so area of triangle = 1/2 * base *height
= 1/2* 100*height=50*height
But unable to find height
Sorry friend