Hypotenuse 10 cm, one of the legs 8, how to find the unknown side?

In a right-angled triangle, the sum of the squares of the legs is equal to the square of the hypotenuse (Pythagorean theorem).

a² + b² = c²;

a² + 8² = 10²;

a² + 64 = 100;

a² = 100 – 64;

a² = 36;

a = √36;

a = 6 cm – unknown leg (side) of a right-angled triangle.

Answer: 6 cm

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