9. Parimal decides to make twenty conical birthday caps from waxed colour papers for his
younger brother's birthday party. He wants to keep the slanting height and the base diameter
of each of the caps as 10 cm and 16 cm respectively. If each colour paper measures 1256
cm^2. find the number of sheets Parimal has to buy for the purpose. (Take x = 3.14) *plz ans properly or I will report
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