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11 January, 18:58

Triangle def with the given measurements is rotated in space about side de. which answer gives the solid formed and its surface area? pyramid with surface area a = 1212 • pbase • l triangle with surface area a = 1212 • r • h cone with surface area a = π • r • l π • r2 cone with surface area a = π • r • h

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  1. 11 January, 19:24
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    The rotation of a triangle will form a cone. The surface area of a cone is calculated through the equation,

    SA (cone) = πrl + πr²

    Hence, for this item the best answer would be cone with surface area a = π. r. l + π. r2, the third choice.
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