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Two cones with same base radius 8 cm and height 15 cm are joined together along their bases. Find the surface area of the shape so formed.

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Answer 854 cm2


            According to question


            Here are two cones joined together along their bases

            Height of both cone = 15 cm

            Base radius of both cone = 8 cm

            Surface area of combination = 2(surface area of one cone)

                                                            (Q both cones are same)

                        =2(\pi r l)

                        =2\pi r \sqrt{r^2+h^2}             \left (Q1= \sqrt{r^2+h^2} \right )

                        = 2 \times 3.14 \times 8 \times \sqrt{64+225}

                        = 2 \times 3.14 \times 8 \times 17


            Hence the surface area of the combination is 854 cm2

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