If the sum of two sides of a triangle is 21 cm and its perimeter is 35 cm, then what is the length of the third side?

6 cm

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5 cm

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14 cm

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7 cm

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Solution

The correct option is C 14 cm
Given the sum of two sides of a triangle is 21 cm and perimeter is 35 cm.

Perimeter of a triangle is equal to the sum of all three sides.

$\Rightarrow$ Length of the third side = Perimeter - Sum of two sides
= (35 - 21) cm
= 14 cm

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