Page 1 - 10 Math Worksheet-Ch 9-

SAI INTERNATIONAL SCHOOL

Class X

Sub: Mathematics

Worksheet-9.1

Ch-3 Applications of Trigonometry

1. If the length of the shadow of a tree is decreasing then the angle of elevation is:
(a)Increasing
(b)Decreasing
(c)Remains the same
(d)None of the above

2. The angle of elevation of the top of a building from a point on the ground, which is
30 m away from the foot of the building, is 30°. The height of the building is:
(a)10 m
(b)30/√3 m
(c)√3/10 m
(d)30 m
3. If a tower 6m high casts a shadow of 2√3 m long on the ground, then the sun’s
elevation is:
(a)60°
(b)45°
(c)30°
(d)90°
4. The angle formed by the line of sight with the horizontal when the point being
viewed is above the horizontal level is called:
(a)Angle of elevation
(b)Angle of depression
(c)No such angle is formed
(d)None of the above
5. The line drawn from the eye of an observer to the point in the object viewed by
the observer is said to be
(a)Angle of elevation
(b)Angle of depression
(c)Line of sight
(d)None of the above
6. From a point on the ground, which is 15 m away from the foot of the tower, the
angle of elevation of the top of the tower is found to be 60°. The height of the
tower standing straight is: