The equation \( r = \frac{d}{2} \) represents the relationship between the radius \( r \) and the diameter \( d \) of a circle. Specifically, the radius is half of the diameter.

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Here are 5 related questions:
1. How do you calculate the circumference of a circle given the radius?
2. What is the formula for the area of a circle using the radius?
3. How does the relationship between the diameter and radius affect the calculation of the circumference?
4. If the diameter of a circle is 10 cm, what is the radius?
5. How would you express the diameter in terms of the radius?

**Tip:** The diameter is always twice the length of the radius, so if you know one, you can easily find the other.

Explore the relationship between circle radius and diameter with a clear explanation of the formula r = d / 2. This concept is fundamental in geometry and essential for understanding circle properties. Suitable for students in Grades 5-6.

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