What is the angle of the sides from the base of a three-sided pyramid where the sides are identical?

Correct answer:

A =  54.7356 °

Step-by-step explanation:

a=1 h1=a2(a/2)2=12(1/2)20.866 x=23 h1=23 0.8660.5774 cos(A)=x/a A=180πarccos(x/a)=180πarccos(0.5774/1)=54.7356=54448"

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