You can divide this problem into two steps:
1) Divide the circumference by (2 x pi) to get the radius.
2) Use this radius in the standard formula for the surface area of the sphere.
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The surface area of a cylinder with a radius of 6cm and a height of 9cm is 565.5 units2
56.549 cm
It is 28.3 cm, approx.
Doubling the radius doubles the circumference.
The area of a rectangle of sides 9cm and 10cm is:9cm x 10cm = 90cm2This is equivalent to 0.009m2