The length of the shadow of a vertical tower on level ground increases by 10 m when the altitude of the sun changes from 45° to 30°. The height of the tower is:

The length of the shadow of a vertical tower on level ground increases

1.	The length of the shadow of a vertical tower on level ground increases by 10 m when the altitude of the sun changes from 45° to 30°. The height of the tower is:
A.	10(√3 + 1) m
B.	5√3 m
C.	5(√3 + 1) m
D.	10√3 m
Answer» D. 10√3 m