Question

Radius of circular base of an ear of corn is 6.6 cm and its length is 11.2 cm. If on an average 1 sqcm area contains 2 corn kernels, find the total number of kernels on a corn.

Answer 1

r = 6.6 cm

length of corn = h = 11.2 cm

Curved surface area of cone-shaped corn = πrl

= 3.14 × 6.6 × 13

= 269.412 cm²

Number of kernels = curved surface area × 2 

= 269.412 × 2 

= 538.824

∴ average no. of kernels on the corn = 539.