The perimeter of a triangle is 17.5 cm. The length of the first side is 0.4 of its perimeter.

| June 23, 2021 | education

The perimeter of a triangle is 17.5 cm. The length of the first side is 0.4 of its perimeter. The length of the second side is equal to 0.8 of the length of the first side. Find the length of the third side of the triangle.

To solve this problem. remember, to find a part of a number, you need to multiply this number by a part. We calculate the length of the first side, knowing that it is 0.4 part of the perimeter, that is, from 17.5 cm.
0.4 * 17.5 = 7 cm.
We calculate the length of the second side, knowing that it is 0.8 part of the length of the first, that is, from 7 cm.
0.8 * 7 = 5.6 cm.
Let’s calculate the length of the third side, knowing that the perimeter is 17.5 cm. Recall that the perimeter of a triangle is equal to the sum of the lengths of its three sides.
17.5-7-5.6 = 4.9 cm.
Answer: 4.9 cm.



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