who discovrerd circle
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tejeswar sivaji vechemgi discovered radius in circle
Archimedes discovered how to work out the area of the circle, and he also discovered pi.
Archimedes created the formula for measuring the circumference of a circle he used many-sided polygons, both inside and out to approximate it.
It was not invented but discovered by ancient mathematicians who found that the circumference of any circle when divided by its diameter is always the same ratio for any circle.
Pi is the value of a circle's circumference divided by its diameter and its true value has never been discovered because it is an irrational number