The perimeter of triangle ABC is 62 cm, BC = 17 cm, AB = CA. Find the length AB.

In order to find the side AB, you must first subtract the known side of the BC from the perimeter, which is the base in the isosceles triangle, that is, from the perimeter the number “62” subtract the number “17”. And we get the number “45” centimeters.

The number “45” is the sum of the isosceles sides. Since these sides are equal, then to find one side, you need to divide the number “45” by the number “2”. We get the number “22.5” centimeters.

That is, the AB side is equal to the CA side and is equal to 22.5 centimeters.