The surface area of a triangular pyramid is 305 square inches. The area of the base is 35 square inches. Each face has a base of

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The surface area of a triangular pyramid is 305 square inches. The area of the base is 35 square inches. Each face has a base of

9. What is the slant height?
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Mathematics

1 answer:

musickatia [10] · Answer 1 · 2022-04-23T00:46:45+03:00

Subtract 35 from 305, and you get 270. The formula for the area of a triangle, where b is base and h is height, is b * h / 2. There are three faces, or 3 triangles, and we know the base, so we can say that 3 * 9 * h / 2 = 270 => 27 * h / 2 = 270 => 27 * h / 2 * 2 = 270 * 2 => 27 * h = 540 => 27 * h / 27 = 540 / 27 => h = 20, so the slant height is 20 inches.