Area of black surface in the following image is ______ cm 2 . Note: 1. All curves have same radii. 2. Use the value of pi as $\frac {22}{7}$ .

Question:

Area of black surface in the following image is ______ cm².
Note:
1. All curves have same radii.
2. Use the value of pi as $\frac {22}{7}$ .

Updated On: Oct 22, 2024

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The answer is 140.

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