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19 February, 08:48

The diameter of the base of right cone 12 cm. The total surface area of the cone is 306 cm^2

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  1. 19 February, 09:04
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    A = πr² + πrl

    306.00 = 3.14 (6) ² + 3.14 (6) (l)

    306.00 = 3.14 (36) + 3.14 (6l)

    306.00 = 113.04 + 18.84l

    - 113.04 - 113.04

    192.96 = 18.84l

    18.84 18.84

    10.24 ≈ l
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