• ajprincess
plssssssssssss help. (i)Expand (lxm).(lxn). Hence prove that the acute angle between two faces of a regular tetrahedron is cos^-1(1/3). (ii)Expand (lxm)x(lxn), and show its direction depends on whether the triad l,m,n is right- handed or left-handed. Hence prove that the volume of a regular tetrahedron is ((sqrt2)a^3)/12, where a is the length of each edge.
Mathematics
• Stacey Warren - Expert brainly.com
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SOLVED
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