Two.
A trapezium can have at most two right angles. But it need not have any.It is a quadrilateral and so the sum of its four angles must be 360 degrees. If there are 3 right angles then they sum to 3*90 = 270 degrees and so the fourth must be 360-270 = 90 degrees. Therefore it has four right angles and then is no longer a trapezium but a rectangle!
The fewest number of right angles in a triangle is zero.
Zero. An equilateral triangle, for example, has no right angles.
Zero, or, if it has to have one, one.
0 or 1. A right triangle has one right angle. All other triangles have zero right angles.
The minimum number is zero(0). The maximum number is one (1).
There are zero right angles in a trapizoid............
Origin
A convex nonagon can have between zero (0) and three (3) right angles. A general nonagon can have between zero (0) and six (6) right angles.
a coordinate plane
coordinate plane
No.