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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 circumference of base in terms of large pi.

OPTIONS
A. 

large 56pi cm

B. 

large 112pi cm

C. 

large 72pi cm

D. 

large 100pi cm

Right Option : B
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

Circumference of base = large 2pi r=2times pi times 56=112pi cm

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