Practicing Success
The base of a right pyramid is a square of side 12\(\sqrt {2}\) cm and each of its slant edge is of length 15 cm. What is the volume of the pyramid? |
576 cm2 616 cm2 786 cm2 864 cm2 |
864 cm2 |
AM = 15 cm Diagonal of square ABCD = \(\sqrt {2}\)a = \(\sqrt {2}\) × 12\(\sqrt {2}\) = 24 cm Half of diagonal = OA = \(\frac{24}{2}\) = 12 cm Therefore, height = 9 (9, 12, 15 ← Triplets) Vol. of pyramid = \(\frac{1}{3}\) × base area × h = \(\frac{1}{3}\) × 12\(\sqrt {2}\) × 12\(\sqrt {2}\) × 9 = 864 cm2 |