Changes

'''Pi''' is an important mathematical constant. It is defined as the ratio of the circumference of a [[circle]] to its diameter. In formulas, pi is given as a Greek letter (<big><math>\pi</math></big>) while diameter expressed as "2r" (double the radius). So the relation is:

'''Pi''' is an important mathematical constant. It is defined as the ratio of the circumference of a [[circle]] to its diameter. In formulas, pi is represented as a Greek letter (<big><math>\pi</math></big>) while diameter expressed as "2r" (double the radius). So the relation is:

:<big><math>C=2 \pi r</math></big>

:<big><math>C=2 \pi r</math></big>