This picture demonstrates the famous formula:Area of a circle = Pi r2Here's how to see it:Look at the slices in the circle - each slice is "r," the radius, long on a side.Here is what we know before we start:The circumference
From William Blake's "Auguries of Innocence,"Thinking about infinity is the heart of calculus. "To see a world in a grain of sand, And heaven in a wildflower,
This picture demonstrates the famous formula:Area of a circle = Pi r2Here's how to see it:Look at the slices in the circle - each slice is "r," the radius, long on a side.Here is what we know before we start:The circumference
