Sophia's online courses not only save you money, but credits are also eligible for transfer to over 2,000 colleges and universities.*
Pretend that we don't know the value of PI. Pretend that we don't know that the area of the circle is PI times the radius squared. How are we going to figure out the area anyway? Check this out: You can put six equilateral triangles inside of a circle and get a rough estimate for the circle's area using a genius hack!