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 ...

Image caption, Using π = 3۰142, find the circumference a circle with a radius of 3۰25 cm. Give the answer to 3 significant figures. 2 × 3۰142 × 3۰25 = 20۰423. This is rounded to 3 ...