SOLUTION: can u give me surface area of a circle questions to practise??

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Question 255831: can u give me surface area of a circle questions to practise??
Answer by solver91311(24713) About Me  (Show Source):
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Area of a circle with radius 5.

Area of a circle with diameter 6.

Area of a circle with circumference 12.

Express all answers in terms of

Super Double Plus Extra Credit:



Each of the circles above has a radius of 5, and where it looks like they touch is actually a point of tangency. There is a quatrefoil shaped area marked A in the center of the diagram, and the bottom circle is marked B. What is the area A + B? Hint: connect the centers of all adjacent circles forming a square with sides twice the radius of any of the circles. Extra hint: The answer is an integer.

John