The surface area of a sphere inscribed in a regular tetrahedron is 144 cm? 21. What is the radius of the sphere? a) 12 cm 22. What is the altitude of the tetrahedron?. a) 20 cm 23. If a sphere is inscribed in a cube of side What is the volume of the sphere? b) 7 cm c) 6 cm d) 5 cm b) 24 cm c) 28 cm d) 48 cm a) 36ncm3 b) Tcm3 288 d) 972 ncm3 _24. A prismatoid has an upper base of 90% , a lower base of 2100% , an altitude of 100 cm, and a midsection of 120?. What is its volume? a) 7000 cm 25. Find the midsection of a frustum of a square pyramid if its lower base is 20 cm on a side, its upper base is 12 cm b) 11 500 cm c) 13 000 cm d) 17 500 cm on a side, and the altitude of the frustum is 14 cm. b) 240 cm? a)144 cm? c) 256 cm? d) 400cm?