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Two sides of a triangle are 5 cm and 4 cm. The perimeter of the triangle is12 cm. What is the third side?

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1 c m

2 c m

3 c m

6 c m

answer is C.

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Detailed Solution

It is given the first side of a triangle is

5

cm and the second side of a triangle is

4

cm,
The perimeter of the triangle

12 c m

.
Therefore, the third side of the triangle is,

12 − (5 + 4) ⇒ 12 − 9 ⇒ 3

Hence, The length of the third side is

3 c m

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