If the length of two sides of a triangle are 5 cm and 12 cm, then which of the following cannot be the length of the third side?

5 cm

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9 cm

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12 cm

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13 cm

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Solution

The correct option is A 5 cm
The difference of length of any two sides of a triangle is smaller than the third side.

Given, the length of two sides of a triangle are 5 cm and 12 cm.

So,
(12 cm - 5 cm) < Third side
Third side > 7 cm

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