Mathematics for IGCSE & O level - Mensuration (Section 9 - No. 47)
All the edges of the square-based pyramid are 5cm. Calculate its volume.
29.4 cm³
29.5 cm³
29.0 cm³
30.0 cm³
คำอธิบาย
h = √(l² - (b/2)²) = √ (5² - 2.5²) = 4.33, Volume = 1/3 * area of base * height = 1/3 * 5² * 4.33 = 36.1 cm³