# Find the perimeter of a triangle with two sides 2 cm long and the third side 11 mm shorter than the sum

March 28, 2021 | education

| **Find the perimeter of a triangle with two sides 2 cm long and the third side 11 mm shorter than the sum of the lengths of these sides.**

First, you need to determine the sum of the lengths of the two sides of the triangle.

We sum up 2 and 2 cm.

We get:

2 + 2 = 4 cm.

We translate this value of length into millimeters.

Since 1 cm is 10 mm, we get:

4 * 10 = 40 mm.

Find the length of the third side.

To do this, subtract the difference from the sum of the two sides, namely 11 mm.

Will be:

40 – 11 = 29 mm.

From this it follows that the perimeter of the triangle will be equal to:

40 + 29 = 69 mm.

69 mm = 69/10 = 6 cm 9 mm.

Answer: The perimeter of the triangle is 6 cm 9 mm.

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