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there is many ways to write when classifying a triangle, you can classify it by its sides or angles. When you classify it by angles you can classify it by acute, obtuse, and right triangle. when classyfing it by sides its isosceles, equilateral, and scalene!
a rectangle has 4 right angles, a parallelogram has 2 acute angles and 2 obtuse angles
-- quadrilateral -- parallelogram
You can classify triangles by:Whether one of their angles is greater than 90 degrees, equal to 90 degrees, or all angles are less than 90 degreesWhether they have two or three congruent angles (equivalent to having two or three congruent sides)I think that's about it.
It has 2 opposite equal obtuse angles and 2 opposite equal acute angles whereas a square has 4 equal angles of 90 degrees