6) The angle formed by the line of sight with the horizontal when it is above the horizontal level is:
A) angle of elevation
B) angle of depression
C) right angle
D) none of these
7) A ladder is leaned against a wall with angle of 60° with the ground and its foot is 6 feet away from the wall. Then the length of the ladder is:
A) 12 feet
B) 36) feet
C) 6 feet
D) 24 feet
Explanation:Ladder against wall: angle = 60°, base = 6 ft
Use cosine:
Answer: 12 feet
8) Two cars are seen from the top of a tower of height 75 m with angles of depression 30° and 45°. If the cars are on opposite sides of the tower along the same line, the distance between them is:
A) 75(√3+1) m
B) 75(√3-1) m
C) 75(√3+1) m
D) 75(√3-1) m
Explanation:From top of tower: height = 75 m, angles = 30° and 45°
Use:
Distance at 30° = 
Distance at 45° = 
Total distance =
Answer: 75(√3 + 1) m
9) The number of tangents a circle can have from a point outside the circle is:
A) one
B) two
C) three
D) four
10) The angle made by the tangent at any point of the circle with the radius at the point of contact is:
A) 0°
B) 45°
C) 60°
D) 90°