GED Math Practice Test

What is the diameter of a circle?

1. The longest distance across the circle

2. The area of the circle

3. The circumference of the circle

4. The length of a chord in the circle

The correct answer is: The longest distance across the circle

The correct answer is "A. The longest distance across the circle." The diameter of a circle is the longest distance that can be measured across the circle, passing through the center. It is essentially a line segment that touches two points on the circle and goes through the center. The other options are not correct because: - Option B, the area of the circle, is the measure of the space inside the circle, not the diameter. - Option C, the circumference of the circle, is the distance around the circle, not the diameter. - Option D, the length of a chord in the circle, is a line segment connecting two points on the circle, but it may or may not pass through the center, unlike the diameter.