in figure, for 7. radius=4.1,
for 8. radius=8.7
What is radius of a circle ?
Radius of a circle from area: if you know the area A , the radius is r = √(A / π) . Radius of a circle from circumference: if you know the circumference c , the radius is r = c / (2 * π) . Radius of a circle from diameter: if you know the diameter d , the radius is r = d / 2 .
A radius is a measure of distance from the center of any circular object to its outermost edge or boundary. A radius is not only a dimension of a circle but also for a sphere, semi-sphere, a cone with a circular base, a cylinder having circular bases.
What is radius in a circle?
A straight line extending from the center of a circle or sphere to the circumference or surface: The radius of a circle is half the diameter. the length of such a line.A circle can be defined as the focus of a point moving in a plane, in such a manner that its distance from a fixed point is always constant. The fixed point is known as the center of the circle and distance between any point on the circle and its center is called the radius of a circle.
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