An ellipse is a conic section, a curving line which is the path of a point that moves in such a way that the sum of its distance from two fixed points is constant.... so no - there are not 4 straight angles in an ellipse, nor any straight bits at all.
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a Rhombus...
If you draw two lines intersecting, you'll see that they create 4 angles.
There are right angles, acute angles, obtuse angles, and straight angles.
No. A trapezoid is a 4-sided flat shape with straight sides that has a pair of opposite sides parallel. The opposite angles not congruent.