A tree is 8km due south of a building. Kofi is standing 8km west of the tree. How far is Kofi from the building?
- 4√2km
- 8km
-
8√2km
- 16km
The correct answer is: C
Explanation
\(x^2 = 8^2 + 8^2\)
\(x^2 = 64 + 64 = 128\)
\(x = \sqrt{128}\)
= \(8\sqrt{2}\) km