To find the equation of a circle when you know the radius and centre, use the formula \({(x - a)^2} + {(y - b)^2} = {r^2}\), where \((a,b)\) represents the centre of the circle, and \(r\) is the ...

Want to calculate the radius of a circle from its area or perimeter? Here are the key formulas that no one explains clearly! ...

The tangent is perpendicular to the radius which joins the centre of the circle to the point P. As the tangent is a straight line, the equation of the tangent will be of the form \(y = mx + c\).

In general, a good math model for a sine wave is: y=A*sin(ωt+Φ) Let’s dissect what this equation to see what ... a point on a moving and rotating circle. So each cycle is 2π radians.