Look for arcs inside each vertex. The same number of arcs indicate ... Lengths of 4 cm, 5 cm and 9 cm do not make a triangle, they create a straight line. Lengths of 6 cm, 5 cm and 9 cm do create ...
Why not try drawing a picture using only straight lines. A triangle has 3 sides and 3 vertices (corners). A vertex is where two lines meet or join. There are different kinds of triangles.
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