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That's right. In a circle, the length of a diameter will be the same as twice the length of a radius.
Yes, all radii of a circle have the same length. One often thinks of the radius as being this length.
In geometry, a radius is a line segment that connects the center of a circle to any point on its circumference. The plural form of radius is radii, which refers to more than one radius within the same circle or sphere. So, the main difference between radii and radius is that radii is the plural form of radius, indicating multiple line segments from the center to the circumference of a circle.
The radius of a sphere is equal to one-half the diameter. If the volume of the sphere is known, then the radius (r) is equal to the cube root of 3/4 of (Volume/pi).
one ares is equal to 2.47 cents