let AB be the height of the window and CD represent the height of the opp. house.Here, A represents the window and C & D are the top and foot of the opp. house. From A,draw a perpandicular AE to CD

So, CD=CE+ED

Also,AB=ED=60m

In triangle AEC, we have:-

tan60=CE/AE

or, root3=CE/AE

or, CE=AE x root3--------(1)

In tr. AED,we have:-

tan45=ED/AE

or, 1=60/AE

or,AE=60m-------(2)

Placing the value of AE from (2) to (1), we have :-

CE=60 x rt.3

Now, height of house=CD

But,CD=CE+ED

or, CD=60*rt.3+60

or, CD=60(rt.3 + 1)

Hence, we have showed that height of house is equal to