SECTION B NO 13

The figure below is a sketch of a roundabout with four roads. The  internal radius is 4cm and external radius is 7cm. If there is a dotted  line in the middle of each road which divides it into two, used by cars  moving in opposite directions and these dotted lines meet at the  centre of the roundabout, draw an accurate design of the roundabout and

(a)  Findthe angle between the roads measured from the centre and  basing on the dotted lines.

(b)  Measure the distance y in cm.

(c)  Given that 1cm represent 2m, find this actual distance in km.

(d)  Using the above scale, find how many centimetres will represent a  distance of 650km.