The most basic answer would be a square, which is both symmetrical and regular.
However, rectangles are also symmetrical, as are hexagons with two opposing 90° angles and four matching 135° angles.
In fact, the number of potential shapes are infinite, unless you specify exactly how many right angles the shape must have.
A square shape for example has 4 right angles and a right angle is 90 degrees.
squares, right triangles, rectangles
rectangle
A square and a rectangle have 4 interior right angles also a right angle triangle has 1 right angle of 90 degrees
All polygons can have right angles except for circle and ovulated shapes. The only 'regular polygon' that has a right angle is the quadrilateral.
wich shaps have right angles
Most shapes have no right angles. Circle, pentagon, hexagon etc. Ones that do include the square and some triangles.
A square shape for example has 4 right angles and a right angle is 90 degrees.
Triangles
The diagonals of a square and a rhombus cross at right angles.
right triangle square rectangle
Acute angles
squares, right triangles, rectangles
a rhombus
square
A-F
quadrilaterals