Like the parallel relationship in space, perpendicular relationship in space is important. In this

Like the parallel relationship in space, perpendicular relationship in space is important. In this section, we will know how the line perpendicular to the plane, the plane perpendicular to the plane ... and what conditions ich guidelines we get it.
Line perpendicular to the plane Definition 1. A straight line is called perpendicular to the plane if it is perpendicular to every line in that plane. Notation: a (P) and (P) a 2. Characterization Theorem 1. (Conditions to a line perpendicular to the plane) If a straight line perpendicular to the lines intersect in the plane the straight line which is perpendicular to that plane. Theorem 2 (Theorem three perpendicular) For a straight line projection on the plane (P) is a straight line. ' Then the line b in the plane (P) perpendicular to a if and only if it is perpendicular to a '.
3. The sections perpendicular and oblique planes Cho (P) and O (P). H is called ich guidelines the projection of O on (P); A, B is the point on (P) but not identical to H. I have: 1. OH OA = OB shortest 2. HA = HB 3. OA > OB HA> HB Angle 1. The angle between two lines The angle between two lines d1 and d2 is the angle between two lines d 1 and d 2 and goes through a turn and parallel (or identical) to d1 and d2. Call Number: 2. The angle between the two planes Definition: The angle between the two planes is the angle between two lines respectively two planes perpendicular to it. Note: The angle between the two planes are smaller than or equal to 90º 3. The two perpendicular planes Definition: Two planes are called perpendicular if the angle between them by 90º Conditions ich guidelines to two perpendicular planes: Two planes perpendicular to each other if and only if one of the two planes which contain a line perpendicular to the plane of the rest.
Distance 1. The distance from a point to a line Definition: The distance from point M to the plane (P), denoted d (M, (P)) (or to line d, denoted by d (M, d)) is the distance between two points M and H, with H is the projection of the point M on the plane (P) (or d). Comment: The distance from a point to a plane (straight line) is the smallest distance than the distance between M and N any point in the plane (line) d (M, (P)) = 0 M (P); d (M, d) = 0 M d 2. The distance between the line and the plane parallel between two parallel planes Definition 1: The distance from a straight ich guidelines line to the plane (P) parallel to a, is the distance from a point to a plane of (P). Call Number: d (a, (P)). Definition 2: The distance between two parallel planes is the distance from any point of the plane now to the other plane. Call Number: d ((P), (Q)). 3. The distance between the two lines cross Definition 1: Given two straight lines a and b overlap. When there exists only one line c cut two diagonal lines a and b, and perpendicular to a and b. C straight line above is called mutual perpendicular lines a and b overlap. Suppose cut a straight line c and b, respectively weights M and N, the MN is called mutual perpendicular lines a and b overlap. Definition 2: The distance between the two lines cross is generally perpendicular to the length of the lines there.
Comment: The distance between the two lines cross the distance between two straight lines parallel to the plane which contains the line remaining gap between the two lines cross the distance between two parallel planes, respectively which contains two lines. Click here to check out what was learned offline! Relationship Guide perpendicular to do quiz: huongdanlambaitracnghiem "Every morning we have two choices: continue sleeping with his dream or wake up and pursue dreams. How about you? What do you choose? "
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