When the sun's altitude changes from 30° to 60°, the length of the shadow of a tower decreases by 70m. What is the height of the tower?

When the sun's altitude changes from 30° to 60°, the length of the s

1.	When the sun's altitude changes from 30° to 60°, the length of the shadow of a tower decreases by 70m. What is the height of the tower?
A.	5 m
B.	40 m
C.	0.6 m
D.	0.2 m
Answer» D. 0.2 m