The major and minor axes of a circle are the same - either is any diameter. So a semimajor axis is half the diameter which is 12 cm.
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Well, when an ellipse has zero eccentricity and is called a circle, its major and minoraxes are both the same length. In fact, every axis through the center has the samelength, even the oblique ones, and every one of them is called a "diameter".So the semi-major axis of a circle is half of the diameter, typically referred to as the "radius".In your circle, that's 12 cm.
If a circle has a diameter of 24 inches its circumference is: 75.4 inches (diameter x Pi = circumference).
12mm - half the diameter.
the diameter of a circle is double the radius so if the radius is 12 cm then the diameter is 24 cm
The circumference of a circle is calculated using the formula C = πd, where C is the circumference, π is a mathematical constant approximately equal to 3.14159, and d is the diameter of the circle. In this case, the diameter of the circle is 24 inches. Therefore, the circumference of a 24-inch round circle would be C = π * 24 = 75.398 inches.