What is the area of a circular shaped aluminum plate with a diameter of 7 feet, rounded up?

To determine the area of a circular shaped aluminum plate, you can use the formula for the area of a circle, which is A = πr², where "A" is the area and "r" is the radius of the circle.

First, the radius is half of the diameter. Given a diameter of 7 feet, the radius would be:

r = diameter / 2 = 7 feet / 2 = 3.5 feet.

Next, you would square the radius:

r² = (3.5 feet)² = 12.25 square feet.

Now, using the area formula:

A = π * 12.25 square feet.

Using the value of π (approximately 3.14), you can calculate the area:

A ≈ 3.14 * 12.25 ≈ 38.79 square feet.

When rounded up, this value gives you approximately 39 square feet. Therefore, the area of the circular aluminum plate is best represented by the choice that indicates 39 square feet. This aligns with the calculations and confirms the suitability of this rounded value.