The diameter of a circle is a line segment that passes through the center of the circle and has its endpoints on the circle. It is the longest chord of the circle and it divides the circle into two equal halves.
The formula to find the diameter (d) of a circle when the radius (r) is given is:
d = 2 * r
Example 1: If the radius of a circle is 5 cm, find the diameter.
Solution: Using the formula, d = 2 * r, we get d = 2 * 5 = 10 cm. So, the diameter of the circle is 10 cm.
Example 2: If the diameter of a circle is 12 inches, find the radius.
Solution: Since d = 2 * r, we can rearrange the formula to solve for r: r = d / 2. Substituting the given value, we get r = 12 / 2 = 6 inches. So, the radius of the circle is 6 inches.
Here are some key points to remember about the diameter of a circle:
Practice using the formula to find the diameter when the radius is given, and vice versa. Also, solve problems involving the diameter in real-life situations to strengthen your understanding of this concept.
.