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Convert degrees to radians

Convert degrees to radians-example-1

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1. 15°= 15π÷180 = π÷12

2. 40° = 40π÷180 = 2π÷9

3. 65°= 65π÷180 = 13π÷36

4. 21°= 21π÷180= 7π÷60

5. 81°= 81π÷180 = 9π÷20

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