What is the side AB of triangle ABC if its perimeter is 20cm. , AC = 7cm, BC = a cm? Find the length of side AB.
| May 25, 2021 | education
In order to find the perimeter of the triangle, you need to add the lengths of the three sides. Accordingly, in order to find the length of the side, knowing the lengths of the other two and the perimeter, you need to subtract the lengths of the known sides from the perimeter. Knowing that the two sides of the triangle are, respectively, AC = 7 cm, BC = 8 cm, and the perimeter is 20 centimeters, we calculate the length of the third side.
20 – (7 + 8) = 20 – 15 = 5 centimeters.
Answer: 5 centimeters.
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