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.60.6 m
B.140 m
C.35 m
D.20.2 m
Answer:A
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.60.6 m B.140 m C.35 m D.20.2 m