Interpretation of projective theorem

An explanation of projective theorem. The theorem that any side of a triangle is equal to the sum of the other two sides projected on this side. That is, a = bcosc+ccosb, b = acosc+ccosa, and c = acosb+bcosa.

Word decomposition

Interpretation of projection: from a point perpendicular to a straight line or a plane, the vertical foot is the projection of this point. The projective connection of each point on a line segment is the projection of this line segment. Beat; Because it is said; Beat; This kind of animal will make people sick by spraying people with sand. ; Projection; Also; Beat; The explanation of the detailed theorem of alias can be used as a proposition or formula of a principle or law, and a certain law or truth can be explained in detail through theoretical proof. Everything is done by Han Feizi: "Every principle can be divided into Fiona Fang, weakness, weakness and firmness." . So, after you decide, you can get the word. So the theorem has existence, death, birth and ups and downs. One of my husband's things is dead. You can tell at a glance.