Reviewed by Janice S. Armas
What is half of a diameter of a circle called?
Answer: Half of a diameter of a circle is called the radius
In geometry, circles are defined by several important measurements, including the diameter and the radius. Understanding these basic elements is crucial for solving many types of circle-related problems. Here, we explore what you call half of a circle’s diameter.
Methods
Math Tutor Explanation Using the Definition Method
By understanding the definitions of diameter and radius, we can identify the correct term for half the diameter.
Step 1: Step 1: Recall that the diameter is the longest distance across the circle, passing through the center
Step 2: Step 2: Remember that the radius is defined as the distance from the circle’s center to any point on its edge, which is exactly half the diameter
Math Tutor Explanation Using a Formula Approach
We can use basic circle formulas to determine what half the diameter represents.
Step 1: Step 1: Write the equation: radius = diameter ÷ 2
Step 2: Step 2: Substitute to see that half the diameter equals the radius
Step 1:
Step 2:
Math Tutor suggests: Learn More About Circles and Their Parts
Expand your understanding of circles by exploring these questions about the radius, area, and segments of circles.
FAQ on Circle Measurements
What is the definition of a radius?
The radius is the distance from the center of a circle to any point on its edge.
Is the radius always half the diameter?
Yes, the radius is always half the diameter of a circle.
Can you calculate the diameter if you know the radius?
Yes, simply multiply the radius by 2 to find the diameter.
Why is understanding the radius important?
The radius is essential for most circle calculations, including area and circumference.
What other parts of a circle are commonly named?
Other parts include the chord, tangent, secant, and arc.
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