1.

A quadrant of a circle of radius 8.4 cm is changed as cone. find radius and slant height of cone.

Answer»

Radius of QUADRANT of circle, R = 8.4cm
PERIMETER of quadrant = \frac{2 \pi R}{4} =  \frac{ \pi \times 8.4}{2}=4.2 \pi

Perimeter of quadrant = Perimeter of BASE of cone
let radius of cone = r
2 \pi r=4.2 \pi \\ \\ r= \frac{4.2 \pi }{2 \pi } =2.1\ cm
SLANT HEIGHT of cone is R, so slant height is 8.4cm.



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