Discussion
If 
denotes the area of a circle with diameter d, then which of the following is equal to 
?
*This question is included in Nova Math - Problem Set D: Defined Functions, question #4
denotes the area of a circle with diameter d, then which of the following is equal to ?
| (A) | |
| (B) | ... |
| (C) | ... |
| (D) | ... |
| (E) | ... |
| (F) | ... |
The solution is
Posted: 06/02/2013 09:36
I need help on this problem have no clue
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
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
Posted: 07/24/2013 16:24
PI is 3.14, not exactly 3!
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Edit
Posted: 12/03/2015 17:43
I get everything up until 36π^2 but where does the 12 come from
Posted: 12/03/2015 18:41
Hi Joelene,
The 12 inside the circle is what is presented in answer-choice D.
Nova Press
The 12 inside the circle is what is presented in answer-choice D.
Nova Press