Question

An electrician has to repaired and electric fault on the pole of height 5 cm. She needs to reach
13 m below the top of the pole to undertake the repair work (see figure)
a) what is the length of BD
b) what should be the length of ladder ,when inclined at an angle of 60 degree to the horizontal ?
c) how far from the foot of pole should she place the foot of the ladder ?
d) if the horizontal angle is changed to 30 degree then what should be the length of the ladder ?
e) what is the value of angle B
​

Answer 1

Answer:

sin60°=

l

3.7

2

3

=

l

3.7

l=4.277m

tan60°=

x

3.7

x=2.138

x≈2.14m

Length of ladder =4.27m

Distance =2.14m