That will vary, depending on the pentagon.
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A pentagon can have:none (regular or irregular pentagon)one, two or three right angles (irregular pentagon).
A pentagon can have anywhere from none to three right angles. For a pentagon to have any right angles however, it has to be uneven, because the sum of all interior angles of a pentagon always equals 540 degrees.
The other three angles will each measure 120 degrees.
In triangles the angles can be all sorts of measurement but the three angles always add to 180 degrees. In quadrilaterals the angles usually measure to 90degrees in all four corners. But in things line trapezoids and parallelograms the angles differ. In a pentagon the angles are 120 degrees. All five of them.
A pentagon and a triangle are both polygons. There are three triangles in a pentagon. Both a triangle and a pentagon have exterior angles that add up to 360 degrees