EASY
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A surveyor wants to find out the height of a tower. He measures the angles at as shown in the following figure and finds that and is from the base of the tower. If the height of a tower is , then find the value of .



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Important Questions on Trigonometrical Ratios of Some other Angles
MEDIUM
A boy is standing at some distance from a tall building and his eye level from the ground is . The angle of elevation from his eyes to the top of the building increases from to as he walks towards the building. Find the distance he walked towards the building.

MEDIUM
If is an acute angle of a , right-angled at , then the value of is:

EASY
When the length of the shadow of a tree becomes equal to the height of the tree, then the angle of elevation of Sun becomes _____.

HARD
A simple pendulum of length subtend at the vertex in one full oscillation. What will be the shortest distance between the initial position and final position of the bob?

EASY
In , and , then show that

MEDIUM
If calculate and ( is an acute angle)

EASY
long ladder leans on the wall such that its lower end remains away from the base of the wall, then _____.

EASY
The rod of a TV disc antenna is fixed at right angles to the wall and a rod is supporting the disc as shown in the figure. If long and , find .

EASY
If , then find the value of

MEDIUM
For acute angle ,
_____

MEDIUM
If , then find the value of .

EASY
In right-angled at . The value of is:

MEDIUM
In right-angled at . Find the values of .

MEDIUM
If , calculate and . is an acute angle.

MEDIUM
If , then the value of is:

