Mathematics
Jonas513
5

What is the surface area of a conical grain storage tank that has a height of 37 meters and a diameter of 16 meters? Round the answer to the nearest square meter. A. 2,831 square meters B. 2,664 square meters C. 1,152 square meters D. 1,131 square meters

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(1) Answers
ingridy

The surface area of a cone is equal to the base plus the lateral area. The base is a circle, and has a diameter of 16 meters. The radius is always half the diameter, so it is 8 meters. The area of a circle = πr², where r is the radius. π(8)² = 64π ≈ 201.06193 The area of the base is ≈ 201.06193. To find the lateral area of the cone, we need to find the slant height. Since the height, radius, and slant height of the cone form a right triangle, we can use the Pythagorean Theorem to find the slant height with what we are given. radius² + height² = slant height² 8² + 37² = slant height² 64 + 1369 = slant height² 1433 = slant height² slant height = √1433 The lateral area of a cone is equal to πrl, where r = radius and l = slant height. πrl = π(8)(√1433) ≈ 951.39958 (there are other formulas which do the same thing, but it doesn't matter.) Now we add the lateral area and base together to find our surface area. 201.06193 + 951.39958 = 1152.46151 which rounds to C. 1,152 m².

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