d) f) There is a triangular + semi-circle pillar (outlined in blue as shown below) at the centre of the structure from the floor to the roof. g) Find the volume of the pillar by using below double integrals via Wolfram Alpha (Screen capture the inputs and outputs). Show and explain the working steps, particularly on how the upper and lower limits are obtained. CH(y) z(x,y) dx dy Ja Jh(y) e) By using the reversed order double integrals, find the volume of the pillar in part (d) at the centre of the structure from the floor to the roof via Wolfram Alpha (Screen capture the inputs and outputs). Show and explain the working steps, particularly on how the upper and lower limits are obtained. cd cG(x) Jg(x) z(x, y) dy dx Use Matlab (integral2 function) to find the volume of the pillar in (d) at the centre of the structure from the floor to the roof by using below double integrals. Use the limits that you have found in (d). Screen capture the inputs and outputs. ( Semi-circle CH(y) z(x, y) dx dy CG (x) [P g(x) (10 marks) z(x, y) dy dx (8 marks) Use Matlab (integral2 function) to find the volume of the pillar in (d) at the centre of the structure from the floor to the roof by using the reversed order double integrals. Use the limits that you have found in (e). Screen capture the inputs and outputs. (6 marks) (6 marks)