180 degrees
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All four angles of a rectangle must equal 90 degrees each.
true
Yes. In fact, it must contain TWO angles of measure less than 90 degrees.
no. the angles in a triangle must add up to 180 degrees. The right triangles must have an right angle (90 degrees). If you add up all the angles they will not measure 180 degrees.
The sum of the exterior angles of any polygon must be 360 degrees. Subject to that constraint, individual angles can have any measure between 0 and 360 degrees.