Diameter of the cylindrical pillar = 56 cm
Thus its radius, r = d/2
= 56/2 = 28 cm = 28/100 m = 0.28m
Height of the pillar, h = 35 m
Total number of pillars =16
Cost of painting = ₹ 5.50 per sq. m.
C.S.A. of each pillar = 2πrh
= 2 × 22/7 × 0.28 × 35
= 2 × 22 × 0.04 × 35 = 61.6 m2
∴ C.S.A. of 16 pillars = 16 × 61.6 = 985.6 m2
Cost of painting 16 pillars at the rate of ₹ 5.5 per sq.m.
= 985.6 × 5.5
= ₹ 5420.8