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Perpendicular Lines civicpride-kusatsu.net Topical outline | Geometry outline | MathBits" Teacher sources Terms of Use contact Person: Donna Roberts

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NOTE: The techniques for proofs that the theorems proclaimed on this page are "discussed" only. A "formal" proof would require that more details be listed.

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

The statement above is in reality a theorem i m sorry is questioned further under on this page.

You are watching: If two adjacent angles have their exterior sides in perpendicular lines, then

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There space a couple of usual sense principles relating come perpendicular lines:


1. The shortest street from a suggest to a heat is the perpendicular distance. any kind of distance, various other than the perpendicular distance, from allude P to heat m will become the hypotenuse of the right triangle. It is known that the hypotenuse of a ideal triangle is the longest next of the triangle.
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2. In a plane, v a suggest not top top a line, there is one, and also only one, perpendicular come the line.

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If us assume there space two perpendiculars to heat m from allude P, we will create a triangle comprise two best angles (which is not possible). Our presumption of two perpendiculars from point P is no possible.

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Perpendicular present can additionally be associated to the concept of parallel lines:


3. In a plane, if a line is perpendicular to among two parallel lines, that is also perpendicular come the various other line. In the diagram at the right, if m | | n and tm, climate t n. The two marked right angles are equivalent angles because that parallel lines, and are because of this congruent. Thus, a right angle also exists whereby line t intersects line n.
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In the diagram in ~ the right, if tm and sm,then t | | s.Since t and s room each perpendicular to line m, we have two best angles whereby the intersections occur. Since all ideal angles are congruent, we have actually congruent corresponding angles which develop parallel lines.


When 2 lines space perpendicular, over there are four angles created at the point of intersection. It renders no distinction "where" you label the "box", since every one of the angles are appropriate angles.

By vertical angles, the 2 angles across from one an additional are the very same size (both 90º). By making use of a linear pair, the adjacent angles add to 180º, making any type of angle surrounding to the box another 90º angle.


When two adjacent angles form a linear pair, their non-shared sides form a directly line (m). This tells us that the steps of the two angles will add to 180º. If these 2 angles also happen to be congruent (of equal measure), we have actually two angles of the same size adding to 180º. Every angle will be 90º make m n.
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In the diagram in ~ the left,