Question

ind the
a) From a point 100 m al
2.) from
ht of the helicopter.
PPLICATIONS OF TRIGONOMETRY-HEIGHTS AND DISTANCES 429
above a lake, the angle of elevation of a stationary helicopter is 30°
of depression of reflection of the helicopter in the lake is 60°. Find the
[CBSE 2008C]
of of a house, which is 10 m high observes the angle of elevation of the
ting as 45° and the angle of depression of the base of the building as 30°.
height of the building and its distance from the house.
tion of a cloud from a point h metres above a lake is a and the angle of
e reflection in the lake is ß. Prove that the height of the cloud is
and the angle
height of the be
b) A man on the mo
ne pole
1 from
E 2007]
from
king
top of the building as 4
Find the height of the
sa The angle of elevation of
depression of its refle
hſtan B+ tana)
(tan ß-tana) metres.
[CBSE 2003]
ngle
ANSWERS (EXERCISE 11.1)
(ii) 2.5 m; 3.535 m (iii) 6.5 m
ove
(c) F1, 3.66 km
1. (a) 1573 m
(b) (i) 10 m
(b) 3 m, 23 m
(ii) 45°
2. (a) 87 m
3. (a) 30°
913
4m
(b) (i) 10 m
(c) 60°
5. 27.58 m
6. 5.568 m​

Answer 1

from a point 100m al

Step-by-step explanation:

1. a/ 1573m

2. c60°

5. 25.85g

6. 2.568g

Answer 2

Answer:

from a point 100m al (1) 27.58e572992936352777292020