If a cylindrical bar has a radius 2 m and height 9 cm and if it is melted and become asphere. What is the radius of spherea) 3b) 6c) 9d) None?

Answer 1

First find the area of the cylindrical bar or cylinder area = 2 · π · r · (r + h). Convert your measurements to the lesser of the two (cm is smaller than meters, so they both need to be cm). Plug your numbers into the formula and solve for area. Next, use a sphere area formula to solve for radius area = 4 · π · r2. Enter the area number you found from the first equation and solve for (r) or radius. Once you arrive at your answer (you need to practice math to learn it), you need to convert your measurement back to meters. Good luck!