The angle of elevation of a bird from a point 30√3 m from the straight line joining the bird to its reflection on a pond is 30°. Find the height of the bird (in m) hovering over the pond? |
60 43.3 20√3 30 |
30 |
1 : \(\sqrt {3}\) tan 30° = QR : PR ↓ ↓ ↓ 30\(\sqrt {3}\) 30 × 1 = 30m |