Matchsticks fun!

Your parents always told you not to play with matches. But let's see if they can be fun without burning you.
The 12-match problem Solutions
You have twelve matchsticks of unit length. As laid out below, they form a square of area 4 square-units.

But those four inside the figure are "wasted" - they contribute nothing.
Can you, dear reader, use all 12 matchsticks to bound a figure that encloses an area of 4 square-units? None of the matches, or parts thereof, should be wasted - that is, be inside the figure. In other words: the figure, of whatever shape, should have a perimeter of 12 units and an enclosed area of 4 units2.

All you have are matches of the same length and a flat surface to place them on. You do have the native ability to lay matches next to each other in straight lines and to make right angles between matches.

You do not have a ruler in match-length units​, nor do you have a protractor​. You can't break the matches into halves or more complicated fractions. And of course, these are theoretical matchsticks - line-segments with only length and no breadth.

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