The perimeter of a triangle is 30cm. Its sides are in the ratio1:3:2,
then find its area.
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Answer:
75
Step-by-step explanation:
Perimeter = 30cm
Ratio = 1:3:2
Let 1st side = x
Let 2nd side = 3x
& 3rd side = 2x
Perimeter of a triangle = a + b + c
(know your formulas)
30 = x+3x+2x
30 = 6x
x = 30 = 5
6
x = 5
∴ 2x = 5×2 = 10
& 3x = 5×3 = 15
Area of a triangle = 1 × b × h
2 (where b is base and h is height)
= 1 × 15 × 10
2 (cancel off 2 with 10)
= 15×5
=75
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Ty♥
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