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Perpendicular Lines princetoneclub.org Topical outline | Geometry summary | MathBits" Teacher resources Terms the Use contact Person: Donna Roberts

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NOTE: The strategies for proofs that the theorems proclaimed on this page are "discussed" only. A "formal" evidence would require that more details it is in listed.

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

The statement over is in reality a theorem which is debated further down on this page.

You are watching: If two lines meet and form right angles, then

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There are a pair of common sense concepts relating come perpendicular lines:


1. The shortest street from a suggest to a heat is the perpendicular distance. any type of distance, various other than the perpendicular distance, from point P to line m will come to be the hypotenuse that the best triangle. It is known that the hypotenuse that a ideal triangle is the longest side of the triangle.
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2. In a plane, through a allude not top top a line, there is one, and also only one, perpendicular to the line.

See more: Understanding Genetic Drift, Bottleneck Events Lead To _______.


If we assume there room two perpendiculars to heat m from suggest P, us will produce a triangle comprise two best angles (which is no possible). Our assumption of two perpendiculars from allude P is no possible.

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


3. In a plane, if a heat is perpendicular to among two parallel lines, that is likewise perpendicular to the other line. In the diagram in ~ the right, if m | | n and tm, climate t n. The two marked right angles are matching angles for 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 also s room each perpendicular to line m, we have two appropriate angles where the intersections occur. Because all ideal angles space congruent, we have actually congruent corresponding angles which produce parallel lines.


When 2 lines space perpendicular, there are four angles developed at the suggest of intersection. It renders no difference "where" you brand the "box", since every one of the angles are ideal angles.

By vertical angles, the 2 angles across from one another are the exact same size (both 90º). By making use of a linear pair, the nearby angles include to 180º, making any kind of angle nearby to the box an additional 90º angle.


When two nearby angles kind a direct pair, your non-shared sides type a straight line (m). This tells us that the measures of the 2 angles will add to 180º. If these two angles also happen to it is in congruent (of same measure), we have two angles of the very same size including to 180º. Each angle will be 90º making m n.
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In the diagram in ~ the left,