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The surface area of a sphere inscribed in a regular tetrahedron is 144 cm2

21. What is the radius of the sphere?

a) 12 cm

b) 7 cm

c) 6 cm

d) 5 cm

22. What is the altitude of the tetrahedron?.

a) 20 cm

b) 24 cm

c) 28 cm

d) 48 cm

23. If a sphere is inscribed in a cube of side What is the volume of the sphere?

a) 36πcm^3

b) 8/3πcm^3

c) 288πcm^3

d) 972πcm^3

(with solution pls)