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The answer will depend on which of the three measures is the height. Ignore that one and multiply the other two to get the base area.

Q: What is the base area of a box that is 3 and a half inches 13 inches in 8 inches?

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multiply 12.5;12.5; and 6.25 together

length of base in centimeters or inches times height in centimeters or inches

8 x 3.5 = 28 square inches

The perimeter of the base is 140 inches.

The squared area of the box, from the question itself, is 61 square inches. Scaling up the linear dimensions by a factor of 10 will make the area 6100 square inches.

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The height is irrelevant to the area of the base, which is (8 inches)(3.5 inches) or 28 square inches.

A box with a base with area of 56 square inches and a height of 6 inches has a volume of 56 * 6 = 336 cubic inches.

The question is very poorly phrased. It mentions "a base of 8 inches". A base cannot be 8 inches - it can be 8 inches long, or 8 inches wide, or have an area of 8 square inches. If it is either of the first two, the question cannot be answered since the base area requires BOTH, the length and the width, to be known. If it is the third, then the question is redundant because the answer is included in the question. Information about the height is irrelevant.

Lets say its 12 inches by 5 inches by 10 inches It will be 12X5 = 60X10 =600square inches.

multiply 12.5;12.5; and 6.25 together

length of base in centimeters or inches times height in centimeters or inches

8 x 3.5 = 28 square inches

The volume of a cereal box can vary depending on its size. To calculate the volume, you would multiply the length, width, and height of the box. For example, if the box is 8 inches long, 4 inches wide, and 10 inches tall, the volume would be 320 cubic inches.

The area is 64 units. Checked on a calculator .^^

384 square inches

The perimeter of the base is 140 inches.

The squared area of the box, from the question itself, is 61 square inches. Scaling up the linear dimensions by a factor of 10 will make the area 6100 square inches.