58 sq.cm
34 sq.cm
132 sq.cm
77 sq.cm
66 sq.cm
Correct answer is E
Given: length of the arc AOB = 22cm ; L = 6cm
Curved surface area of cone = πrl
Length of an arc = θ360 x 2 πL
= 22cm
but length of an arc = circumference of the cone = 2π
where r is the radius of the cone circle
2πr = 22, r = 222πr
= 11 x 722
= 72
curved surface area = πrl
= 227 x 72 x 6
= 66 sq.cm
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