JAMB - Mathematics (2009 - No. 34)
A cliff on the bank of a river is 300 meter high. if the angle of depression of a point on the opposite side of the river is 60º, find the width of the river?
100m
75√3 m
100√3m
200√3m
คำอธิบาย
| Tan 60 = | 300 |
| x |
| x = | 300 |
| Tan 60 |
| x = | 300 |
| √3 |
x = (300/√3) x (√3/√3)
| x = | 300√3 |
| .....3 |
x = 100√3