There is no definitive answer on how long circles have been in use. The moon and sun are both circles and they have existed since the beginning of time.
People have been drawing circles for a very long time.
you use circles to make stuff round
they use protractors to measure circles
A pair of compasses are use to construct circles and arcs of circles
The question is misguided. You do not use radius only on circles!
The name for the units scientists use for circles are degrees.
use a compass
To use a protractor for circles you find the middle of the circle and you then put the dot on the hole then you measure
The use of quality circles has decreased significantly.
Circles symbolize eternity. They have no beginning and no end.
It has always been in use in our bodies as long as we have been on this Earth.
The use of concentric circles is most commonly used on a target. Concentric circles are placed around a target in which each concentric circle has the same center.