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Explanation:

Let the base radius, height, slant height be r, h and l respectively.

r = 14 cm

h = 26.5 cm

∴ l = r2+h2

∴ l = 29.97 cm ≈ 30 cm

To make a conical cap from a sheet of paper, the curved surface area of cap must be calculated.

Curved surface area = π × r × l

To calculate the area of the sheet required to make 7 caps,

total area = 7 × π × r × l = 7 × 227 × 14 × 3

= 9240 sq.cm.

Hence, option (d).

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