The moon is about 384000 km from the Earth and its path around the Earth is nearly circular. Find the circumference of the path travelled by the moon every month.

The moon is about 384000 km from the Earth and its path around the Earth is nearly circular. Find the circumference of the path travelled by the moon every month.

1. A
2. B
3. C
4. D

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Solution:

Concept: we will use the fact that the moon would revolve around  Earth every month. Thus, in order to solve the question, we use the formula of circumference of the circle. This is given by 2πr.
Here,
$\mathit{radius}=384000\mathit{km}$
So,
$\mathit{length of path in circumference}$
$=2\mathit{\pi r}=2×3.14×384000$
$=2×314×3840$

Hence, the correct answer is option (2) .

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