该图形由 2 个直径为 14 cm 的相同半圆组成。求该图形的周长。取 $\pi = \frac{22}{7}$

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完整解法

13

1. Calculate the total arc length of the two semicircles

The two semicircular arcs make up one full circle.
$\text{Total arc length} = \pi \times d = \frac{22}{7} \times 14 = 44 \text{ cm}$

2. Calculate the length of the exposed straight edges

Each semicircle has a diameter of $14$ cm. Since they overlap by $5$ cm, the exposed straight edge for each semicircle is:
$14 - 5 = 9 \text{ cm}$
Total exposed straight edge $= 9 + 9 = 18 \text{ cm}$

3. Calculate the total perimeter of the figure

$\text{Total perimeter} = 44 + 18 = 62 \text{ cm}$

答案

$62$ cm (option 2)

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该图形由 2 个直径为 14 cm 的相同半圆组成。求该图形的周长。取 π=227\pi = \frac{22}{7}π=722​

完整解法

13

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该图形由 2 个直径为 14 cm 的相同半圆组成。求该图形的周长。取 $\pi = \frac{22}{7}$