The perimeter of a triangle is a cm one of its sides is 5 cm the other b cm. Make an expression to find the third side of the triangle.
| February 20, 2021 | education
The perimeter of a triangle ABC is denoted by the letter P, and its sides are AB, BC, CA.
The perimeter of a triangle is equal to the sum of the lengths of all its sides:
P = AB + BC + CA.
By the condition of the problem, P = a cm, AB = 5 cm, BC = b cm.
Let’s compose an expression for finding the third side of a triangle:
CA = P – AB – BC,
CA = a – 5 – b (cm).
Answer: (a – 5 – b).
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