Mathematics for IGCSE & O level - Mensuration (Section 10 - No. 9)
The curved surface area of a cone is given as 50cm². The formula for finding the slant height (l) of the cone is?
l = (50) / (πr)
l = πr /50
l = 50 - πr
l = 50 / πr²
คำอธิบาย
Curved surface area = πrl