3 ms·
Ask HN: Solve this FoundersFund problem
A sphere has a diameter of 2,160 meters. How many meters long is “Unit X” if the surface of the sphere, measured in square Units X is equal to the volume of the sphere measured in cube Units X? Round to the nearest whole number, and enter the number only.
- markmassie 13y ago1741
- Edmond 13y agonope...try a little harder :)
- markmassie 13y agoIt's early...
- s3b 13y ago360
- Edmond 13y agocorrect..now go ahead and submit your business plan :)
- kenrose 13y agoRadius r = 1080 meters. Volume of a sphere = (4/3) * pi * r^3 Surface area of a sphere = 4 * pi * r^2 We want to find x, some unit of measure. The volume of the sphere in units of x^3 is: ((4/3) * pi * r^3) / x^3 The surface area of the sphere in units of x^2 is: (4 * pi * r^2) / x^2 The problem states these are equal. So: ((4/3) * pi * r^3) / x^3 = (4 * pi * r^2) / x^2 (1/3) * r = x 360 = x