Krishna
0

Step 1: Recall the formulas of the volume and surface area of sphere

                      Volume of sphere = \frac{4}{3} \pi r^3

                      Surface area of sphere = 4 \pi r^2


Step 2: Calculate the surface area of sphere

              GIVEN: Radius = 2.1 cm

              Surface area of sphere = 4 \pi r^2

                                                    = 4 \pi (2.1)^2

                                                    = 4 (3.14) (\frac{21}{10} * \frac{21}{10})      

                                                    = \frac{1386}{25}

                                                    = 55.44 cm^2  


Step 3: Find the volume of sphere

                  Volume of sphere = \frac{4}{3} \pi r^3

                                                = \frac{4}{3} (3.14) (2.1)^3

                                                = 38.808 cm^3