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a1 a2 a3 a4
b1 b2 b3 b4
b1 b2 b3 b4
ks1 ks3 & ks4 Foundation
ks2 ks4 Higher
ks4 Higher Pythagoras' theorem states that the area of the blue square equals the sums of the areas of the other two squares.

Can you prove it?
Please enable Java for an interactive construction (with Cinderella).

This diagram illustrates a possible proof. Can you see it?
Please enable Java for an interactive construction (with Cinderella).