Q16 of 18 Page 226

The moon is nearly 385000 km away from the earth. It takes a round of the earth every month. How much distance does it travel in one month?

Given: Distance between earth and moon = 385000 km



It takes one month for the moon to travel around the earth.


Observe that the path of moon around the earth is circular with radius equal to distance between earth and moon.


So, the distance travelled in 1 month after 1 complete round is equal to the circumference of the circular path.


We know, the circumference of a circle = 2π × radius



⇒ Distance travelled = 2 × 22 × 55000


⇒ Distance travelled = 44 × 55000 km


∴ Distance travelled = 2420000 km


Thus, distance covered by moon in 1 month is 2420000 km.


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