Acute . . . less than 90°
Right . . . 90°
Obtuse . . . more than 90° and less than 180°
Straight . . . 180°
Reflex . . . more than 180° and less than 360°
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Two angles are said to be "congruent" if they are equal. To be more precise, their angle measurement is the same.
A polygon that all sides and angles are the same measurement is a regular polygon.
If the heptagon is regular the angle measurement for three angles would be approximately 385.7
That means they have the same measurement. Any two angles that have the same measurement (for example, in degrees) are said to be congruent.
Rectangles have only right angles (which means 90o angles) whereas quadrilaterals can have any kind of angles, as long as they have 4 sides.