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A regular pentagon, of course, has no right angles, but irregular pentagons can have one, two, or three (but not four, nor five). There are two varieties for both two and three right angles in pentagons -- the right angles can be consecutive, or non-consecutive.
mg.metric geometry - Is this an instance of any existing convex
Mathematics
18, July, 2014
Angles in Pentagon: Definition, Interior, Exterior & Central Angle
Finding a Missing Interior Angle Measure in a Convex Polygon
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Mathematics
The maximum number of right angles in a polygon - Math Central
View question - Please help me
The exterior angles of a (convex) polygon always add up to 2π
