book Maths Puzzle Numerical Ability

The diameter of a round dinner plate is 10 inches. What is the area of the plate?
a)314 square inches
b)39.25 square inches
c)78.5 square inches
d)39.25 square inches

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book Other Question

What is surface area? I have a few problems like this one on my assignment and can't figure them out. I am familiar with the formula r = d/t, but I don't know how to use it in these situations:

"Naok