A flag of height 4 metres is standing on the top of a building. The angle of elevation of the top of the flag from a point X is 45° and the angle of elevation of the top of building from X is 30°. Point X is on the ground level. What is the height (in metres) of the building?
1
√3 + 2
2
2(√3 + 1)
3
4(√3 + 1)
4
(√3 + 1)