What does a triangle with an area of 5 square units look like?

It can have any number of shapes.

It could, for example, have a base of 10 million units and a height of only one millionth of a unit. Or it could be a triangle with a base of only 1 millionth of a unit and a height of 10 million units.

Or it could be an equilateral triangle with sides of (approx) 4.806 units.