Yes providing that they are in the same circle
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Yes, all radii of a circle have the same length. One often thinks of the radius as being this length.
The plural of 'radius' is 'radii', not 'radiuses'. A circle has an infinite number of radii, but they are all of the same length.
Yes, providing that each radius is in the same circle
Yes, all of the radii in a single circle are congruent.
A circle is the locus of points that are equidistant from a fixed point. As a result, all radii of the circle must be of the same length. A diameter is a straight line that goes from the circumference to the centre and on to the circumference on the other side. Thus it is a radius from the circumference to the centre and then another radius from the centre to the circumference. And since these are the same, it is 2 radii in length.