 
 <translate> Cone curved surface area = πrl = 22/7 × 4 × 5 = 440/7 = 62 6/7
Slant height (l) = √r(power2)+h(power2) = √16+9 = √25 = 5
Thus, the answer is (C). <ibo> Nkuku curved n'elu ebe = πrl = 22/7 × 4 × 5 = 440/7 = 62 6/7 Slant elu (l) = √r(ike2) + h(ike2) = √16+9 = √25 = 5 N'ihi ya, azịza ya bụ (C). 