The 1/2 ordinates of a waterplane 120 m long are as follows: (16)

Section AP 1/2 | 1 | 1½ | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 8½ | 9 | 9½ | FP

½ ord 1.2 | 3.5 | 5.3 | 6.8 | 8.0 | 8.3 | 8.5 | 8.5 | 8.5 | 8.4 | 8.2 | 7.9 | 6.2 | 3.5 | 0 m

Calculate:

(a) Waterplane area

(b) Distance of centroid from midships.