Geometry Basics: What is the Formula for the Circumference of a Circle?

What is the formula for the circumference of a circle?
Multiple Choices:
A) C = 2πr ✅
B) C = πr²
C) C = d/2
D) C = r² + π
Answer Explanation:
The circumference of a circle is the total distance around its edge. The formula is:
C = 2πr (where r is the radius of the circle)
or
C = πd (where d is the diameter, and d = 2r)
The incorrect options:
πr² is the formula for the area of a circle.
d/2 does not relate to the circumference.
r² + π is incorrect and has no geometric meaning.
Educational Value:
Understanding this formula is essential in geometry, physics, and engineering. The circumference helps in calculating distances around circular objects, from wheels to planets, and plays a key role in real-world applications like construction and astronomy.
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