The diameter of a circle is considered to be the longest chord because it joins to points on the circumference of a circle. The diameter of a circle is the length of a straight line drawn between two points on a circle where the line also passes through the centre of a circle or any two points on the circle as long as they are exactly 180 degrees apart. Thus the diameter formula is Diameter 2 the measurement of the radius.
A p r 2.
See radius of a circle. Circumference of a circle can also be expressed in terms of diameter as C pd C p d. How to find the length of a chord using different formulas. P Pi 314159 o Circle diameter.