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Maths / Surface Area and Volume / Total Surface Area of Cone
QUESTION
 

A right circular cone has height 90 cm and slant height 106 cm. Find the area of base in terms of large pi.

OPTIONS
A. 

large 3036pi cm^2

B. 

large 56pi cm^2

C. 

large 3136pi cm^2

D. 

large 3100pi cm^2

Right Option : C
EXPLANATION
Explain TypeExplanation Content
Text

large r=sqrt{l^2-h^2}=sqrt{106^2-90^2}=sqrt{11236-8100}

large r=sqrt{3136}=56cm

Area of base = large dpi{120} fn_jvn large pi r^2=pi times 56^2=3136pi cm^2

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