A tri square is a carpenter's tool that is used to check and mark right angles during construction work.
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uses of l-square
I am guessing a triangle because a quadrangle is a square or rectangle i think because quad means four sides i think and three sides would be a tri- like in tri-angle
NO
A square triangle, also known as a right triangle, has three sides, just like any other triangle. The term "square" in this context refers to one of the angles being a right angle, not the shape of the triangle itself. So, a square triangle has two legs and a hypotenuse, totaling three sides.
Start with a 2x2 square (that uses 8 toothpicks) Use the other two to make a 1x1 square in one of the corners of the big one..