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Q: If the angle of elevation of the Sun changes from 30 ° to 45 °, the length of the shadow of a pillar decreases by 20 meters. The height of the pillar is |
A. | 10 ( √3-1 ) m |
B. | 1 ( √3 + 1 ) m |
C. | 20 ( √3-1) m |
D. | 20 (√3 + 1) m |
Answer» C. 20 ( √3-1) m | |