Trigonometric Ratios (sin, cos, tan, cot, sec and cosec)

These six trigonometric ratios form the base of trigonometry. So, learn them carefully. Lets suppose we have triangle ABC right angled at B. We have angle and in .

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by Jashan

Trigonometric Ratios (sin, cos, tan, cot, sec and cosec)

These six trigonometric ratios form the base of trigonometry. So, learn them carefully. Lets suppose we have triangle ABC right angled at B. We have angle and in .

by Jashan

In one of the post we learnt values of sin, cos, tan, cot, cosec and sec for 0, 30, 45, 60 and 90 degrees. You can review the post here http://mathinstructor.net/2012/08/values-of-trigonometric-ratios-for-0-30-45-60-and-90-degrees/

by Jashan

**Applications of Trigonometry Heights and Distances Chapter 9 Exercise 9.1 Question 16**

**16. ** The angles of elevation of the top of a tower from two points at a distance of 4 m and 9 m from the base of the tower and in the same straight line with it are complimentary. Prove that the height of the tower is 6 m.

by Jashan

**Applications of Trigonometry Heights and Distances Chapter 9 Exercise 9.1 Question 15**

**15. **A straight highway leads to the foot of a tower. A man standing at the top of the tower observes a car at an angle of depression of 30, which is approaching the foot of the tower with a uniform speed. Six seconds later, the angle of depression of the car is found to be 60. Find the time taken by the car to reach the foot of the tower from this point.

by Jashan

**Applications of Trigonometry Heights and Distances Chapter 9 Exercise 9.1 Question 14**

**14. **A 1.2 m tall girl spots a balloon moving with the wind in a horizontal line at a height of 88.2 m from the ground. The angle of elevation of the balloon from the eyes of the girl at any instant is 60. After some time, the angle of elevation reduces to 30. Find the distance traveled by the balloon during the travel.

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