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- 20 10 Mathematics optimization of the fifth grade in the next semester P6 1 Question 14.
20 10 Mathematics optimization of the fifth grade in the next semester P6 1 Question 14.
If the diameter is d, the arc length of the semicircle diameter is (π d)/2 ≈1.57d. 。
∴d+ 1.57d= 10. 18
d≈4
∴S=3. 14×4÷2=6.28
(I suspect it should be 10.28)
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