EM-3036

Testing for a right angle

E Math · Secondary 4 · Medium · Testing for a right angle

A triangle has side lengths 5 cm, 12 cm and 13 cm. Decide if it is a right-angled triangle.

It is right-angled because $5^2 + 12^2 = 13^2$ .
It is right-angled because $5 + 12 = 13$ .
It is not right-angled because $5^2 + 12^2 > 13^2$ .
It is not right-angled because the longest side must be 12 cm.

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