Construct, full size, the template shown below, showing clearly the:

(i) centres of the arcs
(ii) points of tangency.

2b) Two circles, P and Q diameters 50 and 40 respectively, touch each other tangentially:
Draw:

i). the circles;
(ii) a circle R, diameter 150, to include circles P and Q tangentially' at the upper part
(iii) an arc, radius 20, to exclude circles P and Q tangentially at the lower point.