18. An electrician has to repair an electric fault on a pole of height 5m. She needs
y + 5 = 0 d) x - y + 5 = 0
to reach a point 1.3m below the top of the pole to undertake the repair work. She
puts a ladder making an angle of 60° with the ground to reach the point of fault.
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In Fig. 9.5, the electrician is required to reach the point B on the pole AD. So, BD = AD – AB = (5 – 1.3)m = 3.7 m. Here, BC represents the ladder. We need to find its length, i.e., the hypotenuse of the right triangle BDC. Now, can you think which trigonometic ratio should we consider? It should be sin 60°. Therefore, she should place the foot of the ladder at a distance of 2.14 m from the pole.Read more on Sarthaks.com - https://www.sarthaks.com/257529/electrician-has-repair-electric-fault-pole-height-she-needs-reach-point-below-top-the-pole
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