They are classified as follows:-
acute angle is greater than 0 but less than 90 degrees
right angle is 90 degrees
obtuse angle is greater than 90 but less than 180 degrees
reflex angle is greater than 180 but less than 360 degrees
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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
The opposite angles in a parallelogram are defined to be equal.
-- 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.