Use Pythagoras' theorem to calculate the hypotenuse of the square (or indeed any rectangle) you want to mark out. Then measure the sides from one corner and make sure the hypotenuse length is as calculated. You can mark the end points of the various sides with an arc and where they meet is where the square is.
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it is like a fill in the blank
What value, in place of the question mark, makes the polynomial below a perfect square trinomial?x2 + 12x+ ?
A tri square is a carpenter's tool that is used to check and mark right angles during construction work.
it looks like a check mark. it is called the radical. it looks like this --> √
0.4 to find on a calculator: type in 0.16 then press the button that looks like a check mark.