a circle
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A square and and a triangle
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?
Shapes that have four sides are known as quadrilaterals.
Tessellations
There are no such shapes because all squares are quadrilaterals - by definition.