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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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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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Solution:

If two cones with same base and height are joined together along their bases, then the shape so formed is look like as figure shown.

Hence, the surface area of shape so formed is 855 cm²

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