Line-plane angle formula: sinθ=h/1, through not parallel to the plane of the line on a point for the plane of the plumb line , the intersection of this line with the plane and the original line with the plane of the intersection of the line with the original straight line constitutes the line and the original straight line, the line and the original straight line of the angle of the residual angle that is, for line plane angle.

Formulas in mathematics, physics, chemistry, biology, and other natural sciences that use mathematical symbols to express the relationship between several quantities. It is universal and suitable for all problems with similar relationships. In mathematical logic, a formula is an object of formal syntax for expressing a proposition, except that this proposition may depend on the values of the free variables of the formula.

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An angle, in geometry, is a geometric object consisting of two rays with common **** endpoints. These two rays are called the sides of the angle, and their common **** endpoints are called the vertices of the angle. A normal angle would be assumed to be in the Euclidean plane, but angles can also be defined in Euclidean geometry. Angles have a wide range of applications in geometry and trigonometry.

Euclid, the father of geometry, had defined an angle as the relative slopes of two non-parallel lines in the plane. Proclus believed that an angle could be a trait, a quantifiable quantity, or a relationship. Eudemus considered an angle to be a deviation relative to a straight line, and Cabus of Antioch considered an angle to be the space between two intersecting lines. Euclid considered angles to be a relationship, though his definitions of right, acute, and obtuse angles were all quantitative.