Question

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Answer 1

Answer:

Step-by-step explanation:

Sphere:

1) a) r =  7 cm

 $\sf \boxed{\text{Volume of sphere= \dfrac{4}{3}\pi r^3 }}$

                             $\sf =\dfrac{4}{3}*3.14*7*7*7\\\\= 1436 \ cm^3$

 $\sf \boxed{\text{\bf Surface area of sphere = 4\pi r^2 }}$

                                           = 4*3.14 * 7 * 7

                                           = 615.44 cm²

b) r= 8.4 cm

     $Volume = \dfrac{4}{3}\pi r^3$

                  $\sf =\dfrac{4}{3}*\dfrac{22}{7}*8.4*8.4*8.4\\\\= 2483.7 \ cm^3$

   Surface area = 4*3.14*8.4*8.4

                         = 887.04 cm²

Hemisphere:

      a) r = 6 cm

     $\sf \boxed{\text{\bf Volume of hemisphere = \dfrac{2}{3} \pi r^3 }}$

                                                $\sf =\dfrac{2}{3}*3.14*6*6*6\\\\= 452.16 \ cm^3$

        $\sf \boxed{\text{\bf Surface area of hemisphere=3 \pi r^2}}$$\sf \boxed{\text{\bf Surface area of hemisphere = 3 \pi r^2 }}$

                                                            = 3 * 3.14 * 6 * 6

                                                             = 339.12 cm²