Lizzie created a circular swimming pool in her garden. The shape of the garden forms a triangle. The diameter of the circular pool is 4200 mm. The slant height of the triangular side of the garden is 13 000 mm and the other side which is the base is 7000 mm. The depth of the pool is 1600mm. 1. Calculate the volume of the swimming pool in m². 2. Determine the perimeter of the triangular garden in meters 3. Prove that the area occupied by the garden only is 31.65m²