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If denotes the area of a circle with diameter d, then which of the following ... ...

If Image denotes the area of a circle with diameter d, then which of the following is equal to Image?
Image
(A)
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set D: Defined Functions

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If denotes the area of a circle with diameter d, then which of the following ... ... 
Posted: 06/02/2013 09:36
I need help on this problem have no clue
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Posted: 06/06/2013 23:02
Petit, 4-in-a-circle is the same as the area of a square with diameter=4. Area = π*(.5*4)^2 = 4π. 6-in-a-circle is, by the same logic, is π*(.5*6)^2 = 9π.

Multiply the first and the second, and you get 36π^2.

Answer D is π*12-in-a-circle = π* 12-in-a-circle = π*π*(1/2*12)^2 = 36π^2
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Posted: 07/24/2013 16:24
PI is 3.14, not exactly 3!
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If denotes the area of a circle with diameter d, then which of the following ... ... 
Posted: 12/03/2015 17:43
I get everything up until 36π^2 but where does the 12 come from
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Posted: 12/03/2015 18:41
Hi Joelene,

The 12 inside the circle is what is presented in answer-choice D.

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