High school mathematics solves why two sides can be obtained by calculating the area ratio of a triangle.

High school mathematics solved why the dihedral angle can be obtained by calculating the area ratio of triangle.

(20 12? As shown in the figure, the second mode plane ABC in Haidian District, PA⊥, with point C on ⊙O and AB as the diameter, ∠CBA=π/3?

, PA=AB=2, point e is the midpoint of line segment PB, point m is on arc AB, om∨AC.

(3) Let the dihedral angle M-BP-C be θ, and find the value of cosθ. Why do you find S△PBC and S△PMB, and you can find the dihedral angle M-BP-C by the area ratio?

Solution:

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