xtmilx
12-06-2007, 04:58 AM
A pyramid has square base ABCD with length z cm and the angle of inclination between the slant edge AT and the diagonal AC of the base is 60 degrees, where T is the top of the pyramid.
1) Find the exact value of the face angle ATB
2) If, in general, angle TAC = x, prove that the cos of angle ATB = (sin^2)x for 0-90 degrees
1) Find the exact value of the face angle ATB
2) If, in general, angle TAC = x, prove that the cos of angle ATB = (sin^2)x for 0-90 degrees