Question

18. Aruna bought a new building for her office. She wants to put up a sign board of her company on the roof of the building.
From a point P on the ground level, the angle of elevation of the roof of the building is 30° and the angle of elevation of the
top of the sign board is 45º. The point Pis at a distance of 24 m from the base of the building.​

Answer 1

Answer:

tan45

o

=

BC

AC

1=

BC

80

BC=80cm

tan30

o

=

BC+CE

DE

3

1

=

80+x

80

80+x=80

3

x=80

3

−80

x=80(

3

−1)m

The bird travelled 80(

3

−1)m

Speed of bird =

Time

Distance

=

2

40(

3

−1)

=40(

3

−1)m/s

∴ Speed =40(

3

−1)m/s,