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Perpendicular Lines ptcouncil.net Topical synopsis | Geometry outline | MathBits" Teacher resources Terms that Use contact Person: Donna Roberts

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NOTE: The methods for proofs the the theorems declared on this page are "discussed" only. A "formal" proof would call for that an ext details it is in listed.

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Perpendicular lines (or segments) actually form four appropriate angles, also if only among the appropriate angles is significant with a box.

The statement above is in reality a theorem i beg your pardon is questioned further down on this page.

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

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There are a couple of typical sense concepts relating to perpendicular lines:


1. The shortest distance from a point to a line is the perpendicular distance. any kind of distance, various other than the perpendicular distance, from allude P to heat m will come to be the hypotenuse that the ideal triangle. It is recognized that the hypotenuse that a right triangle is the longest side of the triangle.
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2. In a plane, with a allude not on a line, there is one, and also only one, perpendicular to the line.

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If us assume there room two perpendiculars to heat m from allude P, us will produce a triangle comprise two right angles (which is not possible). Our assumption of 2 perpendiculars from allude P is no possible.

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Perpendicular lines can likewise be associated to the concept of parallel lines:


3. In a plane, if a heat is perpendicular to one of two parallel lines, the is likewise perpendicular come the other line. In the diagram at the right, if m | | n and also tm, then t n. The two marked right angle are matching angles because that parallel lines, and are thus congruent. Thus, a best angle additionally exists where line t intersects line n.
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In the diagram at the right, if tm and sm,then t | | s.Since t and s are each perpendicular to line m, we have actually two ideal angles wherein the intersections occur. Because all appropriate angles space congruent, we have congruent corresponding angles which create parallel lines.


When two lines are perpendicular, over there are four angles developed at the allude of intersection. It renders no difference "where" you brand the "box", since every one of the angle are right angles.

By upright angles, the 2 angles throughout from one an additional are the same size (both 90º). By using a linear pair, the surrounding angles add to 180º, making any type of angle nearby to the box an additional 90º angle.


When two surrounding angles type a straight pair, your non-shared sides type a right line (m). This tells us that the steps of the two angles will include to 180º. If these two angles additionally happen to it is in congruent (of equal measure), we have two angle of the same size adding to 180º. Each angle will be 90º do m n.
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In the diagram at the left,