The base radius of a circular cone is 9cm and its height is 12cm. What is the radius and central angle of die sector used to make it?

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Aishwarya01 · Answer 1 · 2021-09-15T06:41:07+0000

base radius r = 9 cm

height h = 12 cm

slant height l = \(\sqrt{12^2+9^2}\)

= \(\sqrt{144+81}\)

= \(\sqrt{225}\)

= 15 cm

radius of the sector = 15 cm

centre angle of sector = 360 × \(\frac{9}{15}\) = 216°