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Perpendicular Lines rememberingsomer.com Topical overview | Geometry summary | MathBits" Teacher resources Terms of Use contact Person: Donna Roberts

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NOTE: The tactics for proofs the the theorems declared on this page are "discussed" only. A "formal" proof would require that much more details it is in listed.

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Perpendicular present (or segments) actually type four best angles, also if only one of the appropriate angles is marked with a box.

The statement over is actually a theorem i beg your pardon is questioned further down on this page.

You are watching: Perpendicular lines intersect to form right angles.always sometimes never

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There space a couple of usual sense ideas relating to perpendicular lines:


1. The shortest street from a point to a heat is the perpendicular distance. any kind of distance, other than the perpendicular distance, from point P to heat m will become the hypotenuse the the right triangle. The is known that the hypotenuse the a appropriate triangle is the longest side of the triangle.
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2. In a plane, with a allude not top top a line, over there is one, and also only one, perpendicular to the line.

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If we assume there are two perpendiculars to heat m from allude P, us will create a triangle comprise two right angles (which is not possible). Our presumption of 2 perpendiculars from allude P is not possible.

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Perpendicular currently can additionally be linked to the ide of parallel lines:


3. In a plane, if a line is perpendicular to one of two parallel lines, it is likewise perpendicular to the other line. In the diagram at the right, if m | | n and tm, climate t n. The two marked right angle are matching angles for parallel lines, and are because of this congruent. Thus, a appropriate angle additionally exists wherein line t intersects heat n.
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In the diagram in ~ the right, if tm and sm,then t | | s.Since t and also s room each perpendicular to line m, we have two right angles wherein the intersections occur. Because all ideal angles room congruent, we have congruent matching angles which produce parallel lines.


When 2 lines space perpendicular, over there are four angles created at the suggest of intersection. It provides no difference "where" you label the "box", since every one of the angles are ideal angles.

By upright angles, the two angles throughout from one one more are the exact same size (both 90º). By using a straight pair, the nearby angles include to 180º, making any angle surrounding to the box another 90º angle.


When two nearby angles form a straight pair, your non-shared sides form a straight line (m). This tells united state that the steps of the 2 angles will include to 180º. If these two angles likewise happen to be congruent (of equal measure), we have actually two angles of the same size including to 180º. Every angle will certainly be 90º do m n.
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In the diagram at the left,