Question

The angle of elevatin of the top of an unfinished verticle building on
the level ground, at a point which is 100 meter from the base of the
building is 45". How much height the building must be raised, so that
its angle of elevation from the same point be 60" (5-173)​

Answer 1

Answer:

The ans is attached

Step-by-step explanation:

Answer 2

Answer:Raise needed=100(root3-1)

Step-by-step explanation:

In triangle BCD

tan45=BC/CD

1=BC/100

BC=100m

Let AB=x metres

In triangle BCD

tan60=AC/CD

root3=(100+x)/100

x= 100(root3 -1)

The raise needed is 100(root3-1)metres