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23 March, 13:40

A cone has a circular base with a diameter of 18 inches. the height of the cone is 40 inches. what is the approximate lateral area of the cone? use 3.14 for π and round to the nearest whole number. 565 square inches 580 square inches 1,131 square inches 1,159 square inches

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  1. 23 March, 14:05
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    The lateral area of a cone is expressed as:

    Lateral surface area of a cone: L = πrs = πr√ (r^2 + h^2)

    L = π (9) √ (9^2 + 40^2)

    L = 1159.248

    Therefore, the correct answer is the last option. Hope this answers the question. Have a nice day.
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