The first side of the triangle is 19 cm, and the second is 18 cm longer than the first.
| August 10, 2021 | education
The first side of the triangle is 19 cm, and the second is 18 cm longer than the first. Find the third side of a triangle if its perimeter is 76 cm.
1) Let’s find out how long the second side of the triangle has, if it is 18 cm longer than the first, and the first side has a length of 19 cm.
19 + 18 = 37 cm.
2) Let’s find out what is the sum of the lengths of the sides known to us, if the first side is 19 cm long, and the second is 37 cm.
37 + 19 = 56 cm.
3) Let’s find out how long the third side has, if it is known that the sum of the lengths of the first two sides was 56 cm, and the perimeter of the triangle was 76 cm.
76 – 56 = 20 cm.
Answer: The length of the third side of the triangle was 20 cm.
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