a circle
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A square and and a triangle
Shapes that have four sides are known as quadrilaterals.
Oh, dude, a shape with an area of 36cm square could be a square with sides of 6cm each, a rectangle with dimensions 4cm by 9cm, or even a circle with a radius of about 3.8cm. Like, there are a bunch of shapes that could fit the bill, so it's not just one specific shape, ya know?
Tessellations
There are no such shapes because all squares are quadrilaterals - by definition.