The Height of a Cone is 21 Cm. Find the Area of the Base If the Slant Height is 28 Cm. - CBSE Class 9 - Mathematics
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The height of a cone is 21 cm. Find the area of the base if the slant height is 28 cm.
Slant height ‘l’ = 28 m.
Height of cone (h) = 21cm
∴ Radius of cone (r)=`sqrt(28^2-21^2)` [by Pythagoras theorem]
∴ Area of base = `pir^2`
= `22/7xx7xx7=1078 cm^2`
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Solution The Height of a Cone is 21 Cm. Find the Area of the Base If the Slant Height is 28 Cm. Concept: Surface Area of a Right Circular Cone.