This means that, using Pythagoras’ theorem, the equation of a circle with radius \(r\) and centre (0, 0) is given by the formula \(x^2+ y^2= r^2\). Find the equation of a circle with radius 3 ...

A circular shape or object is one that is in the form of a circle. How many of these circular objects can you name? The radius (or ‘radii’ for plural) is the length of a straight line from the ...

is allowed to roll around the inside of a circle of radius R (see black circle below). We assume that the circle rolls without slipping. If we pick a point inside or on the blue circle (see red point) ...