Using angles and sides:
Using angles only:
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The primary classification of a polygon is according to the number of sides (or vertices) that it has.If all the sides are of equal length and all the angles are of the same measure then it is a regular polygon.If any of the angles is a reflex angle then it is a concave polygon, otherwise it is convex.
All triangles have 3 sides and 3 interior angles that add up to 180 degrees. If you know the lengths of 2 sides of a triangle then the length of the 3rd side can be found by using trigonometry.
The answer depends on what attributes you want to use for classification. These could be:number of sides (vertices),whether or not all sides are equal,whether or not all angles are equal,whether or not all sides and angles are equal (regular),number of parallel sides,number of perpendicular sides,order of rotational symmetry,number of lines of symmetry,convex or concave,various combinations of the above.
Yes, triangles FGH and JKL are similar. The similarity can be established using the Angle-Angle (AA) postulate, which states that if two angles of one triangle are equal to two angles of another triangle, then the triangles are similar. If the angles of FGH correspond to the angles of JKL, the triangles are indeed similar.
You need enough information about both triangles to be able to compareany one of the following packages of parts of both of them:-- the length of any two sides and the size of the angle between them-- the size of any two angles and the length of the side between them-- the lengths of all three sides.