# What is the surface are of a colonial grain storage tank that has a height of 54 meters and a diameter of 18 meters? 1802m^2, 1781m^2, 3110m^2, 1548m^2.. thanks

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MathengThe tank has the shape of a cone So, the area of the cone = Ï€ rÂ²+ Ï€ r s where r is the radiusÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â s is the slant height = âˆš(rÂ²+hÂ²) Â Â Â Â Â Â Â Â Â h is the height given the diameter = 18 m and the height = 54 m âˆ´ r = 9 mÂ ,Â h = 54 m âˆ´ s = âˆš(rÂ²+hÂ²) = âˆš(9Â² + 54Â²) = 54.745 m âˆ´ Area = Ï€ rÂ²+ Ï€ r s Â Â Â Â Â Â Â Â Â Â Â Â = Ï€ * 9Â² + Ï€ * 9 * 54.745 â‰ˆ 1802.3 mÂ² The correct answer is the first option 1802 mÂ²