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Side-Angle-Side. It's a means to test for congruence between two triangles. If you can match the length of a side, the measure of the angle between that side and another side, and the length of that second side, then you have proven the triangles to be congruent.
In general, measure each side and add the measures together.In general, measure each side and add the measures together.In general, measure each side and add the measures together.In general, measure each side and add the measures together.
Width does mean side to side.
Length and width define two dimensions, like a piece of paper has a length distance measure along one side and a width distance measure on the other side. In three dimensions there is length and width and height, like a solid brick or block
-- Measure or calculate the length of one side. -- Measure or calculate the length of another side. -- Measure or calculate the length of the only remaining side. -- Add the three numbers. The sum is the perimeter of the triangle.