1.Pythagoras Theorem.
2.by some people have curly brown hairs till proper brushing.
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Pythagorean theorum.
By using trigonometry or using Pythagoras' theorem for a right angle triangle.
A right triangle has three sides. If you label the sides connected to the right angle side A and side B, and the hypotenuse side C, A^2+B^2=C^2.
Yesterday's date cannot be used.
Yes simply with a protractor and a measuring device.