The circumference, c, of a circle varies directly as the diameter. If the circumference is 44cm when the diameter is 14 cm, find the circumference when the diameter is 21 cm.

Scenario: a rectangular plot of ground is 5 meters longer than it is wide. its area is 20,000 square meters. question: what equation will you find the dimensions? note: let w represent the width. options: w(w+5)=20,000 w^2=20,000+5 (w(w+5))/2=20,000 w+2(w+5)=20,000