No, a trapezoid could not have three right angles. If it did, it would be a rectangle, as the fourth angle would need to be 90 degrees as well. A rectangle is not a trapezoid.
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It would be impossible. A trapezoid can't have three right angles. It would just make a rectangle.
It doesn't have to, but it can. A trapezoid is any shape in which there is a pair of parallel sides. This means that a square can be classified as a trapezoid. But notice that a four-sided shape can never have ONLY three 90° angles. The sum of angles of a four-sided shape is 360--this means that if you have three 90° angles, then the remaining angle must be 360-3(90) which is 90°, giving you four right angles. * * * * * No you cannot. As indicated in the second paragraph of the above answer, three right angles implies that all four angles are right angles and that makes the figure a rectangle (or a square).
You can have two right angles and still be only a trapezoid. With three right angles then it would be a rectangle.
Both a triangle and a trapezoid are polygons with straight sides. However, a triangle has three sides and three angles, while a trapezoid has four sides and four angles. Additionally, both shapes have interior angles that add up to 180 degrees.
Not possible - that would mean the final angle would also have to be ninety degrees - making it a square or rectangle.