Discussion

Explanation:

If we think of the cylinder as a folded sheet of paper, then on opening the cylinder the ant is at position A and the sugar grain is kept at C as shown in the following figure.

​​​​​​​

AB = height of the cylinder = 20 cm

BC = 0.5 × the circumference of the base of the cylinder = 10π cm

∴ AC is the shortest distance that the ant has to travel.

∴ AC = 202+10π2 ≈ 37.25 cm

Hence, option (c).

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