An athletics running track is made from a rectangle measuring 40 m by 20 m, with a semicircular end of diameter 20 m attached to each of the two short sides, so that the two semicircles together form one full circle.
(a)Calculate the total perimeter of the running track, giving your answer to the nearest whole number of metres.(4)
(b)Calculate the total area enclosed by the running track, giving your answer to the nearest whole number of square metres.(4)
(Total for Question 20 is 8 marks)