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Notations for Triangles:
Geometry notations for triangles including the right triangle, congruent sides of a triangle and congruent angles of a triangle

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Notation for a right triangle:

triangle graphic

The notation for the right angle in a right triangle (or any other right angle) is a little square in the corner.

red line

Notation for congruent sides of a triangle:

triangle graphic

Little tick marks are used to show that two sides are the same length (congruent).  You can use just one tick mark, two or three or more -- just as long as you use the same number on sides that are equal.

red line

Notation for congruent angles in a triangle:

triangle graphic

This works a lot like congruent sides (above)...  You make the little rounded sweep in the angle and then use tick marks to show which angles are the same size (have the same measure -- are congruent).

 

 

 

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