An irregular heptagon.
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A seven sided shape is a heptagon.
a Pentagon is five sided and CAN have 3 right angles.
a decagon
The sum of the interior angles of a polygon is 2n - 4 right angles, where n is the number of sides. For a 24 sided shape this gives (2 x 24) - 4 = 44 right angles = 3960°.
A parallelogram does not have to be four right angles. A parallelogram is a four sided shape with two parallel lines.