Advertisement
Advertisement
Last updated at Oct. 5, 2020 by Teachoo
Transcript
Ex 9.1, 1 A circus artist is climbing a 20 m long rope, which is tightly stretched and tied from the top of a vertical pole to the ground. Find the height of the pole, if the angle made by the rope with the ground level is 30° Let, the height of pole be AB. Assuming that rope is tied at point C. It is given that, Length of rope = 20 m Hence, AC = 20m Also, angle made by rope with the ground level = 30° Hence, ∠ACB=30° We need to find height of pole i.e. AB Since the pole is vertical, ∠ ABC = 90° In right triangle ABC sin C = (𝑆𝑖𝑑𝑒 𝑜𝑝𝑝𝑜𝑠𝑖𝑡𝑒 𝑡𝑜 𝑎𝑛𝑔𝑙𝑒" " 𝐶" " )/𝐻𝑦𝑝𝑜𝑡𝑒𝑛𝑢𝑠𝑒 sin 30°= 𝐴𝐵/𝐴𝐶 (1 )/2 = 𝐴𝐵/20 1/2×20 = AB 10 = AB AB = 10 ∴ Height of pole = AB = 10 metre.
Questions easy to difficult
Angle of Depression from point A to point B is same as Angle of Elevation from point B to point A
How to find Height when angle of elevation is given?
How to find Distance when angle of depression is given?
Example 1
EX 9.1, 4
EX 9.1, 5
EX 9.1, 3 Important
EX 9.1, 2 Important
Ex 9.1, 7
Example 4
Example 2 Important
EX 9.1, 8
Example 5
Ex 9.1, 11
Example 7 Important
Example 3 Important
Ex 9.1, 6 Important
EX 9.1, 9 Important
Ex 9.1, 10
Example 6 Important
Ex 9.1, 13 Important
Ex 9.1, 12 Important
Ex 9.1, 16 Important
Ex 9.1, 14 Important
Ex 9.1, 15 Important
EX 9.1, 1 You are here
Questions easy to difficult
About the Author