Save guides, add subjects and pick up where you left off with your BBC account. Find the equation of a circle with radius 3 units and centre (0, 0). The radius, \(r = 3\) and \(r^2 = 9\), so the ...

Which is precisely why today’s article is all about circles. In particular, after a quick refresher of circle basics, we’re going to figure out why the equation for the circumference of a ...