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6 April, 02:15

Holly made 12 pair of earrings for each of her girlfriends. To wrap the pairs individually, she creates a simple cardboard gift box to fold into a pyramid. The base is a square with side lengths 10c m. The sides are 4 equilateral triangles with side lengths 10 cm and height h. The height h is approximately 8 2/3 cm. In square centimeters, what is the minimum amount of cardboard Holly needs to create 12 gift boxes to wrap each pair of earrings individually?

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  1. 6 April, 04:15
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    3280cm²

    Step-by-step explanation:

    We are told the gift box is folded into a Pyramid with a square base.

    Hence, we are to find the Surface Area of a square pyramid

    From the question, we are given:

    Length of the base of the square = 10cm

    Triangle

    Side length = 10cm

    Height = 8 2/3 cm

    A square Pyramid has 5 faces: 4 triangles and 1 square.

    Step 1

    Find the Area of the square

    Formula = Side length² this is because all the side of a square is equal.

    Length of the base = 10cm

    Area of the square = (10cm) ²

    = 100cm²

    Step 2

    Find the Area of the triangle. We are told the 4 triangles are equilateral, which means their side are equal.

    Hence, for one triangle.

    Area of a triangle = 1/2 * base * height

    Base = side length = 10cm

    Height = 8 2/3 = 8.6666666667cm

    Area of a triangle = 1/2 * 10 * 8.6666666667

    Area of a triangle = 43.333333333cm²

    Since we have 4 triangles

    We would have : 4 * 43.333333333cm²

    = 173.33333333cm²

    The Area of the 4 equilateral triangles =

    173.33333333cm²

    Step 3

    The Surface area of the Square Pyramid

    = Sum of the areas of all the faces.

    = 100cm² + 173.33333333cm²

    = 273.33333333cm²

    Therefore, the minimum amount of cardboard needed to make one gift box = 273.33333333cm²

    Step 4

    The minimum amount of cardboard Holly needs to create 12 gift boxes to wrap each pair of earrings individually is calculated as: 12 * 273.33333333cm²

    = 3280cm²
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