Question

Q.A pendulum swings through an angle of 30° and describes an arc 8.8cm in length.Find the length of the pendulum.

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Answer 1

$\bold\pink{†Required \: Answer†}$

$Length \: of \: arc = 8.8 cm \\2\pi \times r \times 30 \div 360 = 8.8 \\ = 2 \times 22 \div 7 \times r \times1 \div 12 = 8.8 \\ r = 8.8 \times 7 \times 12 \div 2 \times 22 \\ r = 739.2 \div 44 \\ r = 16.8cm \\ so \: req. \: length \: of \: pendulum \: is \: 16.8 cm$