Mathematics for IGCSE & O level - Mensuration (Section 10 - No. 4)
Calculate the slant height of a cone of base radius 7cm and curved surface area 150cm².
6.8 cm
6.3 cm
6.2 cm
5.8 cm
解释
Curved surface area = πrl, l = Curved surface area/πr = 150 / (π * 7) = 6.8cm