Lots! As long as half the length of the base times the height is 20...
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There are an infinite number of triangles with different shapes that all have the same area.
Infinitely many.
You could draw four different triangles in a 4-sided polygon, but two are enough to define the polygon.
There are many different triangles that have an area of three square inches, here's one way to draw one: Draw a rectangle whose area is six square inches (or imagine what one's dimensions would be, e.g. 6x1 or 3x2) and cut it in half diagonally to make a right triangle that has an area of three square inches.
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