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The sides of a triangle are in the ratio 3 : 4 : 5. If its perimeter is 36 cm, area of the triangle is ?
57 sq cm
54 sq cm
56.5 sq cm
None of these
Let the sides of the triangle are a,b and c respectively.
3x + 4x + 5x = 36 cm
12x = 36 cm
x = 3 cm
a = 9 cm, b = 12 cm, c = 15 cm
s = (a + b + c)/2 = 36/2 = 18 cm
Area = sq.{s(s - a)(s - b)(s - c)}
= sq.{18(18 - 9)(18 - 12)(18 - 15)}
= sq.{18*9*6*3} = 54 sq cm
Report error
ashasree
See....54 sq cm Hona hey ...no 54 sq m
Anish
units error
correct unit
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