Calculate one of the sides of the triangle, the perimeter of which is 20 cm
| September 21, 2021 | education
Calculate one of the sides of the triangle, the perimeter of which is 20 cm, one of the sides is 5 cm, the other is 8 cm.
The perimeter of a triangle is equal to the sum of the lengths of its three sides.
1) What is the sum of the two known sides of a triangle?
5 + 8 = 13 (cm)
2) What is the length of the third side of the triangle? It is necessary to subtract the sum of the two sides from the perimeter.
20 – 13 = 7 (cm)
Answer. 7 cm.
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