Question

Fond the height of the regular pyramid with each edge measuring l cm.
Also,
(1)if alpha is the angle of between any two edge and face not containing that edge, then proves that cos(alpha)=1/3
(2) if beta is the angle between the two faces, then prove that cos(beta)=1/3​

Answer 1

Step-by-step explanation:

By the pythagorean theorem we know that.

s2 = r2 + h. ...

since r = a/2.

s2 = (1/4)a2 + h2, and.

s = √(h2 + (1/4)a2)

This is also the height of a triangle side.

Answer 2

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