Calculate the perimeter of an isosceles triangle, one side of which is 7 cm and the other 15 cm.

isosceles triangle ABC,
AB = 7 centimeters,
BC = 15 centimeters.
Find the perimeter of an isosceles triangle, that is, P abc -?
Decision:
Consider an isosceles triangle ABC. In it, the sides are equal. The sides cannot be 7 centimeters each, since the main property of the triangle lengths will not be fulfilled. Then BC = AC = 15 centimeters.
The perimeter is the sum of the lengths of all sides.
Then P avs = AB + BC + AC;
R abs = 7 + 15 + 15;
P avs = 7 + 30;
P avs = 37 centimeters.
Answer: 37 centimeters.