Question

the angle of elevation of the top and finished vertical building on a ground at a point which is a hundred metres from the base of the building is 45 degree how much the height of building must be rise so that is angle of elevation from the same point we 60 degree​

Answer 1

Step-by-step explanation:

not much interested in mensuration

Answer 2

Let the height of the building initially be x

tan45° = x/100

x = 100m

Let the height of risen part is y

when angle of elevation is 60°

tan60° = total height/base

tan60° = (x+y)/100

√3 = (x+y)/100

cross multiplication

100√3 = x+y

x is 100

y = 100√3 - 100

y = 100(√3-1)m