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Perimeter of Triangle

Perimeter of ...

Question

Perimeter of a triangle is 58 cm, and 2 of its sides are 18 cm and 20 cm , find the length of 3^rd side of triangle ?

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Solution

Perimeter of triangle = sum of all its sides
∴ 58 cm = 18 cm + 20 cm + 3^rd side
∴Length of 3^rd side = 58 cm – 38 cm = 20 cm

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