"Straight Straight Line and Spherical Distance" ppt (Shanghai Education Edition Senior High School) Courseware

(Shanghai Higher Education Senior High School 3) Mathematics: 15.6 "Distance between Straight Line and Spherical Surface" Two rays AB passing through a point A on the plane, the figure formed by AC is called an angle, and is recorded as ∠BAC. Two passing A points on the plane A straight line can form 4 angles. Generally, the angle between two straight lines is not more than 90 °. In plane geometry, the angle and the size of the angle are generally not distinguished, and the same symbol is used. For example, in the triangle ABC, ∠BAC represents both the angle and the size of the angle.

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