SOLVED:The function A(r)=πr^2 may be used to find the area of a circle if we are given its radius. (GRAPH NOT COPY) Find the area of a circle whose radius is 5
What shape has an area formula of 2(pi)r^2? | Homework.Study.com
Lecture 6
calculus - How does $dV=2\pi R^2t \sin \theta\, d\theta$ come? - Mathematics Stack Exchange