Answer Happy

hi! can someone please explain how did they get these numbers in the tables? the detailed calculation. this is a transformer construction.
gaps the plates which would constitut avoidable losses of area and might contribute to noisy operation (a) (6) (c) (d) Dia, of circum. 1.0 0.71 circle Area, % of circum.circle Gross Net, Ai No.of packets Ai= kd²: k = -0-71- (a) Square 64 58 1 0.45 0.85 0:161 0:9 0.53 0.16 0.10 0.14- 0-42- (b) Cruciform 79 71 3 0.56 0-93 0-10 0-120 0.36 0-09 -0-07 (c) Three-stepped (d) Four-stepped 84 87 75 78 5 7 0-60 0-62 I na