A rectangle. Obviously the right angles are in the four corners of the rectangle. The lines of symmetry occur across the horizontal and vertical. There are no lines of symmetry on the diagonal.
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octagon
It is a trapezoid and its other 2 angles are obtuse and acute
The shape you are describing is a trapezoid. A trapezoid is a quadrilateral with at least one pair of parallel sides. It can have two right angles, but it does not have any lines of symmetry due to its asymmetrical nature.
an equilateral triangle
no shape does! * * * * * Not true. A parallelogram has rotational symmetry of order 2, but no lines of symmetry.