Mathematics for IGCSE & O level - Mensuration (Section 4 - No. 29)
A cone has a base radius of 5 cm and a perpendicular height of 12 cm. Calculate its slant height.
12 cm
13 cm
14 cm
17 cm
คำอธิบาย
Slant height = √(radius² + height²) = √(5² + 12²) = 13 cm