Asked by DJ
How much foil is required to cover a rectangular box that is 4in. by 8in. by 5in.? use 3.14 as an aproximation for pi. where appropriate.
Answers
Answered by
Henry
The foil is to cover the entire
surface area. Therefore, we need to calculate the surface area of the
box. There are six sides or 3 pairs.
1. The front and back areas are equal.
2. The right and left areas are equal.
3. The top and bottom areas are equal.
Therefore, we calculate 3 areas and
multiply each by 2 to get 6 areas.
As = 2(4 * 5) + 2(8 * 5) + 2(8 * 4)
= 40 + 80 + 64 = 184 sq. in. of
foil required.
40 = Area of front and rear.
80 = right and left.
64 = area of top and bottom
surface area. Therefore, we need to calculate the surface area of the
box. There are six sides or 3 pairs.
1. The front and back areas are equal.
2. The right and left areas are equal.
3. The top and bottom areas are equal.
Therefore, we calculate 3 areas and
multiply each by 2 to get 6 areas.
As = 2(4 * 5) + 2(8 * 5) + 2(8 * 4)
= 40 + 80 + 64 = 184 sq. in. of
foil required.
40 = Area of front and rear.
80 = right and left.
64 = area of top and bottom
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