What is the side AB of triangle ABC if its perimeter is in cm, AC 10 cm BC 8 cm find the length of side AB at a = 25?

Let’s compose a short condition for the problem and solve it:
The perimeter of the ABC triangle is a centimeters;
AC – 10 centimeters;
BC – 8 centimeters;
AB -? centimeters;
Let’s solve this problem if a = 25;
Let’s remember what a perimeter is and how to find it:
Perimeter – the sum of the lengths of all sides;
Perimeter of triangle ABC:
P = AB + BC + AC;
From the formula, we derive the value of the side AB, which must be found:
AB = P – BC – AC;
Substitute numerical values into the formula and calculate:
AB = 25 – 10 – 8 = 7 centimeters;
Answer: 7 centimeters