Question

sides of a triangle are in the ratio of 12:17:25 and its perimeter is 540cm.find its area

Answer 1

12x+ 17x+25x=540
54x=540
x=10

area =1/2(l)(b)
= 1/2 × 12x × 17x
= 1/2 × 120 × 170
= 60 × 170
= 10200 sq.cm

hope it helps you

Answer 2

Let the sides be 12x , 17x , 25x
Then, it's perimeter is= 12x+17x+25x
= 54x
But, it's perimeter is 540cm
therefore,
54x= 540
x= 540/54
x= 10cm
Hence, the sides of triangle are12x= 12×10=120
17x= 17×10=170cm
25x=25×10=250cm

Area of triangle= 1/2 × base × height
= 1/2 ×120×170
= 10200cm²

....I am not sure about the area so plz check it...
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