**1. Does Pythagoras' Theorem apply to non-right angled triangles?**

No, the triangle

MUSTbe right-angled.

**2. What is the most common mistake made by people using Pythagoras' Theorem?**

They add together the Hypotenuse with one of the short sides instead of adding the two short sides.

**3. What is the second most common mistake made by people using Pythagoras' Theorem?**

Forgetting to take the square root at the end.