An aeroplane flies due north from airport P to Q and then flies due east R. If Q is equidistant from P and R, find the bearing of P and R

An arc of a circle subtends an angle of 30° on the circumference of a circle of radius 21cm. Find the length of the arc.

Find the equation of the locus of a point P(x,y) which is equidistant from Q(0,0) and R(2,1).

XYZ is a circle with center O and a radius 7cm. Find the area of the shaded region.