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HOW TO LABEL GEOMETRIC SHAPES Right Angle – Each angle whose measure is 90° should be marked with a square at that angle A B Q Example: D C S R This would be read: “Angles A, B, C, and D are right angles.” “Triangle QRS is a right triangle.” Equal Sides – The first set of equal length sides is marked with one line on each side. The second set of equal length sides, but different length from the first set (on the same figure as the first set) is marked with two lines on each side, etc. L M F G Example: O This would be abbreviated/read: LM = NO MN = OL N I H FG = HI GH = IF Parallel Sides – The first set of parallel sides is marked with one arrow on each side. The second set of parallel sides, but at a different angle from the first, is marked with two arrows on each line, etc. A B S T Example: D C V This would be abbreviated/read: AB CD ! U ST UV and TU VS ! ! *Remember – you may use more than one symbol on a figure. Example: J M K L This would be abbreviated/read: JK LM and JK = LM; and KL MJ and KL = MJ ! !