What is the side AB of triangle ABC if its perimeter is 20 cm, A is C7cm, BC is a cm? Find the length of the side AB at a 8cm.
| March 15, 2021 | education
Let us express the side AB from the formula for finding the perimeter of the triangle: P = AB + AC + BC.
AB = P – AC – BC.
Considering that P = 20 cm, AC = 7 cm, BC = a cm, we get:
AB = 20 – 7 – a;
AB = 13 – a.
We calculate the value of the side AB at a = 8 cm.
AB = 13 – a = 13 – 8 = 5 cm.
Answer: AB = 5 cm.
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