A tree is 8km due south of a building. Kofi is standing 8km west of...
MATHEMATICS
WAEC 2000
A tree is 8km due south of a building. Kofi is standing 8km west of the tree. How far is Kofi from the building?
- A. 4√2km
- B. 8km
- C. 8√2km
- D. 16km
Correct Answer: C. 8√2km
Explanation
\(x^2 = 8^2 + 8^2\)
\(x^2 = 64 + 64 = 128\)
\(x = \sqrt{128}\)
= \(8\sqrt{2}\) km
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