find the area of a triangle whose sides are in the ratio 10:9:7 and its perimeter is 130cm
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find the area of a triangle whose sides are in the ratio 10:9:7 and its perimeter is 130cm
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Step-by-step explanation:
let the sides be 10x,9x,7x
gn: perimeter=130cm
10x+9x+7x=130
26x=130
x=130/26=5
the sides are 50cm,45cm,35cm respectively
by using heron's formula:
S=130/2=65cm
A=√[(s(s-a)(s-b)(s-c)]
=√[65*15*20*30]
=√(585000)
764.85cm²
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