Because the triangle ABC is isosceles, the leg of the triangle has the same length. For example, the length of one leg is a, then the other leg is a too.
Input the numbers to pythagorean formula a² + b² = c² a² + a² = 8² 2a² = 64 a² = 64/2 a² = 32 a = √32 a = √16 × √2 a = 4√2
