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What is the spherical building at the junction of Qiyang and Ningjingyan Expressway?
Area of inner circle:
3. 14×(20÷2) 2
=3. 14× 100
=3 14 (m2)
Outer circular area:
3. 14×(30÷2) 2
=3. 14×225
=706.5 square meters
Increased area:
706.5-314 = 392.5m2.
A: At this time, the flower bed area increased by 392.5 square meters.
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