1.

Radius of a cone is 4cm, slant height is 5/2 times radius. Calculate the radius and central angle of the sector.

Answer»

Radius of sector = slant height of cone = \(4\times\frac{5}{2}=10\) cm

Central angle of the sector = radius of cone

\(\times \frac{360}{R}=4\times\frac{360}{10}=144^\circ\)

Central angle = \(360\times\frac{2}{5}=144^\circ\)



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