Mathematics for IGCSE & O level - Mensuration (Section 8 - No. 30)
A solid cone has base radius of 6.5 cm and a height of 6.3 cm. Calculate its total surface area.
235.1 cm²
410.4 cm²
334.4 cm²
256.3 cm²
Vysvětlení
To calculate slant height, s= √(6.3² + 6.5²) = 9.06cm, Total SA = πr(r + s) = π*6.5*(6.5+9.06) = 334.4 cm²