A flower bed is formed by a square, PQRSPQRSPQRS, and a semi-circle. Side PQ PQ\,PQ of the square is the diameter of the semi-circle. The radius of the semi-circle is 6 m. The flower bed is going to be covered completely with mulch. A bag of mulch covers 45 m2.
How many bags of mulch will be needed? You must show your working.
