Answer to Question #148755 in Math for solid mensuration

Question

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)

Answer 1

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