Asked by Morgan

Find the angle, in degrees, between two adjacent sides of the pyramid.
P(2, 0, 0), Q(2, 2, 0), R(0, 2, 0), (base points)
S(1, 1, 7) (tip point)

Answers

Answered by oomath
use cross product to get one side (n1)
n1= 2,0,0 x 1,1,7 = 0,-14, 2
use cross product to get another side (n2)
n2 = 0,2,0 x 1,1,7 = 14,0,-2
cos theta = (n1 x n2) / sqrt(sum of n1square) x sqrt(sum of n2 squares
-4 / sqrt(196+4) x sqrt(196+4)
-4/200
cos theta = - .02
theta = arccos (-.02) = 91.1
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