World%20Rope%20Challenge

1
World Rope Challenge
Hint you do not need to know any values about
the earth just circumference formula.
Diameter

• Imagine a rope was lying on the ground and it
  stretched
• all the way around the world.
• How much more rope would be needed if it was to
  be raised exactly 1 metre from the ground all the
  way round.

Circumference of ANY circle is C pD
www.mathsrevision.com
1 metre above
World
Cw pDw
pDw
C1m p
(Dw 2)
1
1
C1m
pDw
2p

Dw
Difference
-
2p
6.28 metres