The radius must pass through some point between the centre of the circle and its circumference.
Chat with our AI personalities
Centre of area of a triangle is the centre point for a circumscribed radius which will pass through all 3 vertices of the triangle.
To know what a radius is you have to kno what a diameter is. The diameter is the distance accross a circle through its center. The radius is half the diameter.
It has at least two radii, the radius of the circle going through the vertices and the radius of the inscribed circle touching all the sides.
The radius is half the diameter. Draw a line that passes through the centre of the circle and measure it. This is the diameter. Halve it and you will have the radius.
The radius at the equator is 3,963 miles. It's slightly less through the poles.