Difference between revisions of "1978 AHSME Problems/Problem 2"
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Revision as of 15:32, 20 January 2020
Problem 2
If four times the reciprocal of the circumference of a circle equals the diameter of the circle, then the area of the circle is
Solution 1
Creating equations, we get $4\cdot\frac{1}{2\pir} = 2r$ (Error compiling LaTeX. Unknown error_msg). Simplifying, we get $\frac{1}{\pir} = r$ (Error compiling LaTeX. Unknown error_msg). Multiplying each side by r, we get = r^2\pir^2\pi1 = \pir^2\boxed{\textbf{(C) }1}$