Everything 3D
This is a picture of a donut with circular cross sections. Its inner radius is and the outer radius is . Its area of the spine of the torus is equal to its volume. What is ?
The answer is 4.
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1 solution
Volume = (pi)^2(b+a)(b-a). Area of spine of torus = (1/4)(pi)^2(b+a)(b-a)^2. As Volume = Area(numerically) => (pi)^2(b+a)(b-a) = (1/4)(pi)^2(b+a)(b-a)^2. (b-a) = 4.