My system for naming pentagons. Oh, and you can put the angle groups with angle groups and parallel groups, but parallel groups have to go with angle groups. Here’s a definition for each word. Right (A) - one right angle Double right (A) - two right angles Triple right (A) - three right angles Parallelopentagon (P) - one pair of parallel sides Biparallelopentagon (P) - two pairs of parallel sides Acute (A) - three acute angles Obtuse (A) - two obtuse angles Reflex (A) - one reflex angle Double reflex (A) - two reflex angles. Side length groups: Scalene (S) - no sides equal Isoceles (S) - two sides equal Double isoceles (S) - two pairs of two sides equal Triumque (S) - three sides equal Equilateral (S) - all sides equal
