ICBSE 201n38. If at some time of the day the ratio of the height of a

1.	ICBSE 201n38. If at some time of the day the ratio of the height of a vertically standingpole to the length of its shadow on the ground is v3:1 then find theangle of elevation of the sun at that time.[CBSE 2017)
Answer» The height of a vertically standing pole to the length of its shadow on the ground is √3:1 Consider the height of pole be √3 ∴ length of shadow =1. In a triangle ABC, tan ∠ACB = √3/1 tan ∠ACB = √3 ∠ACB = 60°.ANS

ICBSE 201n38. If at some time of the day the ratio of the height of a vertically standingpole to the length of its shadow on the ground is v3:1 then find theangle of elevation of the sun at that time.[CBSE 2017)

Answer»

The height of a vertically standing pole to the length of its shadow on the ground is √3:1

Consider the height of pole be √3

∴ length of shadow =1.

In a triangle ABC,

tan ∠ACB = √3/1

tan ∠ACB = √3

∠ACB = 60°.ANS