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The lengths of two sides of an isosceles triangle are 9 cm and 20 cm. What is the perimeter of the triangle? Give reason.

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The lengths of two sides of an isosceles triangle are 9 cm and 20 cm. What is the perimeter of the triangle? Give reason.

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Third side must be 20 cm, because sum of two sides should be greater than the third side.

∴ Perimeter of the triangle

= Sum of all sides

= (9 + 20 + 20) cm

= 49 cm

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