Two sides of a triangle are 7 cm and 9 cm. Its perimeter is 20
cm; the length of the third side is

3 cm

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4 cm

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5 cm

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6 cm

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Solution

The correct option is A 4 cm
sum of three sides = perimeter of triangle
$\Rightarrow 7 + 9 + third side = 20$
$\Rightarrow 16 + third side = 20$
$\Rightarrow third side = 20 - 16$
$∴ third side = 4 c m$

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