WAEC - Mathematics (2000 - No. 14)
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
설명
\(x^2 = 8^2 + 8^2\)
\(x^2 = 64 + 64 = 128\)
\(x = \sqrt{128}\)
= \(8\sqrt{2}\) km