You've done a lot of work on shapes in KS3 Maths and we've already looked once at Pythagoras' theorem. But, it's such an important part of mathematics that we thought it deserved a second quiz.

Pythagoras Theorem is about a property of all triangles with a right-angle. If a triangle has one angle which is a right-angle (i.e. 90^{o}) then there is a special relationship between the lengths of its three sides. The theorem states that the square of the hypotenuse (the longest side, opposite the right angle) is equal to the sum of the squares of the other two sides. It can be written as the following equation:

a^{2} + b^{2} = c^{2}

See how well you understand Pythagoras' theorem in this quiz. Take your time and read each question carefully. And, one more thing... the diagrams are not drawn to scale. Good luck!

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^{2}+ 12^{2}= 400The square root of 400 is 20