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Margarita [4]
3 years ago
6

20 points to who ever answers first WITH WORK CITED!!!​

Mathematics
1 answer:
Kobotan [32]3 years ago
3 0

Answer:

To find the area of a regular polygon, all you have to do is follow this simple formula: area = 1/2 x perimeter x apothem. Here is what it means: Perimeter = the sum of the lengths of all the sides. Apothem = a segment that joins the polygon's center to the midpoint of any side that is perpendicular to that side.

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lozanna [386]
The triangle <span>pyramid</span>  is made up of 4 triangles.

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Formula:
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Area of triangle = 1/2 x base x height

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Area of the bottom triangle:
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Area = 1/2 x 9 x 7.8
Area = 35.1 yd²

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Area of the 3 side triangles:
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Area = 3 [ 1/2 x 9 x 10 ]
Area = 135 yd²

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Total Area:
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Total Area = 135 + 35.1 
Total Area = 170.1 yd²

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Answer: Surface Area = 170.1 yd².
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Step-by-step explanation:

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