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Congruence tests for triangles Definition Two triangles in the plane are called congruent if they can be identified with each other by superimposing. An action "Superimposing" means placing one transparent image on or over the other one. You just learned definitions of the congruency for the basic cases of the straight segments and angles in preceding lessons Points and Straight Lines basics and Angles basics in this site.

Let me remind you these definitions and major features one more time. Two straight segments are called congruent if they can be identified with each other by superimposing. Two straight segments are congruent if and only if they have the same length.

Two angles are called congruent if they can be identified with each other by superimposing. Two angles are congruent if and only if they have the same angle measure.

In Geometry we accept the following three postulates as valid statements without proof. If two sides of a triangle and their included angle are congruent to the corresponding elements of another triangle, then the triangles are congruent SAS, or Side-Angle-Side postulate. If two angles of a triangle and their included side are congruent to the corresponding elements of another triangle, then the triangles are congruent ASA, or Angle-Side-Angle postulate.

If three sides of a triangle are congruent to the corresponding sides of another triangle, then the triangles are congruent SSS, or Side-Side-Side postulate.

It is clear that if two triangles are congruent, then their corresponding sides and corresponding angles are congruent. It follows from the postulates above that the opposite statement is valid too: Here the term "corresponding" means that the angles included between congruent sides, and sides included between congruent angles are under the consideration.

But the postulates give us more than the last statement. The definition of the triangle congruency, which starts this lesson, gives you the idea about the conception of the triangles congruency.

The three congruency postulates provide you a tool to test and to check quantitatively whether two given triangles are congruent: If two triangles are congruent, then they have, obviously, the same shape and the same size. When you are trying to recognize congruency of triangles drawn in the plane, you will, probably, look for their shape and size first.

But remember that in Geometry you should ground your suggestion about the triangle congruency on the exact length of the triangle sides and the exact angles measure. The triangles you are comparing for congruency might be located in a plane by a number of ways.

Examples below demonstrate typical positions and how postulates work in testing triangle congruency. Triangle ABC Figure 2.

Note that the triangle NOP is obtained from the triangle ABC by the rotation or by two mirror reflections and the translation. The considered examples cover all major dispositions of triangles to compare for congruence. For examples of problems on congruence tests for triangles see the lessons Problems on congruence tests for triangles-2 under the topic Geometry in the section Word problems in this site.

This lesson has been accessed times.There have also been daytime observations of craft that look like giant triangles. The rumors about this area have developed far beyond what is usual even for UFO phenomena.

There have been many claims that the technology that powers the giant triangles has . Two triangles that feature two equal sides and one equal angle between them, SAS, are also congruent. If two triangles have two equal angles and a side of equal length, either ASA or AAS, they will be congruent.

Right triangles are congruent if the hypotenuse and one side length, HL, or the hypotenuse and one acute angle, HA, are equivalent. Although congruence statements are often used to compare triangles, they are also used for lines, circles and other polygons. For example, a congruence between two triangles, ABC and DEF, means that the three sides and the three angles of both triangles are congruent.

* To prove congruent triangles, you need to state 3 statements with the reasons enclosed by brackets * Then write a final conclusion with the test used enclosed by brackets. YOU MUST STATE the 3-LETTER TEST for CONGRUENT TRIANGLES! How to write a reference list for an article; An explanation of the arguments of mencius in support of his views of human nature as naturally good; Internet applications tcp and udp services; Merck and co inc and glaxosmithkline; How to write a fantasy novel for tweens; Subculture hong kong;.

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Lesson Congruence tests for triangles