The same number of arcs indicate equal angles.Different numbers of hash marks indicate different lengths.The same number of hashes indicate equal lengths.To classify a triangle using comparative lengths or angles: in vertices close vertex The point at which two or more lines intersect (cross or overlap). The same number of marks indicate angles are equal in size. Recognise that arcs close arcs (annotation) Curved marks inside the vertex of a shape.The same number of marks indicate equal lengths. Recognise that hash marks close hash marks Short lines marked on the side or edge of a shape.Recognising line symmetry and rotational symmetry will also help. Understanding different types of angles and that angles in a triangle sum to 180° can be helpful when classifying a triangle.
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