The radius of a cone is 4 m, height 5 m. Find the curved surface area?  Choose the correct choice from the following options:
A) 1 B) 3 C) 5 D) 7 E) 9
5one curved surface area = πrl = 22/7 × 4 × 5 = 440/7 = 62 6/7   Slant height (l) = √r(power2)+h(power2) = √16+9= 
<gadget id="calculator">16+9</gadget>
<output>25</output>
√25= 5
<result>C</result>
The radius of a cone is 4 m, height 5 m. Find the curved surface area?