Quiz About Area And Circumference Of A Circle

Explanation
3 x 3 x 3.14

Explanation
Make sure you change the diameter to a radius. (divide by 2)

Explanation
12 x 12 x 3.14

Explanation
7 x 7 x 3.14

Explanation
Area = radius x radius x pi

Explanation
The correct answer is 78.5 inches squared. To find the area of the top of the pizza, we need to use the formula for the area of a circle, which is A = πr^2. Given that the radius of the pizza is 5 inches, we can substitute this value into the formula to get A = π(5^2) = π(25) = 78.5 inches squared.

Explanation
The correct answer is 3.14 feet squared. To calculate the amount of fabric needed to cover the circular stool, we need to find the area of the circle. The formula for the area of a circle is A = πr^2, where A is the area and r is the radius. In this case, the diameter of the stool is given as 2 feet, so the radius is 1 foot. Plugging this value into the formula, we get A = 3.14 * 1^2 = 3.14 feet squared. Therefore, 3.14 feet squared of fabric is needed to cover the stool.

Explanation
The statement is true because the radius of a circle is defined as the distance from the center of the circle to any point on its circumference. The diameter, on the other hand, is the distance across the circle passing through the center. Since the diameter is twice the length of the radius, it follows that the radius is always half of the diameter.

Explanation
The statement is false because a chord is not the longest diameter in a circle. A diameter is a chord that passes through the center of the circle, and it is always longer than any other chord in the circle. Therefore, the longest diameter in a circle is the one that passes through the center, not any other chord.