WAEC - Mathematics (1998 - No. 36)
A ladder 5cm long long rest against a wall such that its foot makes an angle 30o with the horizontal. How far is the foot of the ladder from the wall?
\(\frac{5\sqrt{2}}{3}m\)
\(2\frac{1}{2}m\)
\(\frac{5\sqrt{3}}{2}m\)
\(\frac{10\sqrt{3}}{3}m\)
\(10\sqrt{3}m\)
Объяснение
cos 30 = \(\frac{adj}{hyp}\)
cross multiply:
adj = cos 30 X 5
= 5 \(\frac{√3}{2}\)