A man at ground level views the top of a building at an angl

A man at ground level views the top of a building at an angle of 45degree. After walking in a straight line towards the building at the same altitude for 500 ft, the man views the log of the building at an angle of 59degree. How tall is the building?

Solution

Here circumference is the distance covered by wheet in its one revolution.

So total distance in one revolution = 2 x \\pi x radius = 2 x 3.14 x 18 = 113.04

So total distance covered in 1 second = 113.04 x 12 = 1356.48 iinch

now as 1 inch = 0.0000157828 miles

So 1356.48 inch = 1356.48 x 0.0000157828 = 0.0214 miles

Futher 1 second = 0.00028 hours

So required speed in mph = 0.0214/0.00028

= 77.04 miles per hour.

That is our last answer.