EM-3039

Testing for a right angle

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

A builder measures two sides of a corner of a floor as 15 m and 20 m, and the diagonal between their ends as 24 m. Is this corner a right angle?

Yes, because $24^2 = 15^2 + 20^2$ .
Yes, because $15 + 20 = 35 > 24$ .
No, because $24^2 < 15^2 + 20^2$ .
No, because the diagonal must be exactly 25 m for these sides.

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