Diameter

The diameter of a circle is a straight line that passes through the center of the circle and touches two points on the circle's circumference. It is the longest distance that can be measured within a circle.

Key Points

1. The diameter is always twice the length of the radius of a circle.
2. The formula to find the diameter of a circle is: d = 2r, where d is the diameter and r is the radius.
3. The diameter divides the circle into two equal halves, known as semicircles.

Study Guide

Here are some important points to remember about the diameter of a circle:

• What is the definition of the diameter of a circle?
• How is the diameter related to the radius of a circle?
• Can you find the diameter of a circle if you know its radius? How?
• What are the practical applications of understanding the concept of diameter?

Remember to practice using the formula d = 2r to calculate the diameter when given the radius of a circle. Also, try to visualize how the diameter divides a circle into two equal parts.

Understanding the concept of diameter is crucial for various mathematical and scientific applications, so make sure to master this topic!