I quote " The square on the hypotenuse of a rightangled triangle..."
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no it dose not
None. Triangles - whether equilateral or not - do not have diagonals
An 18-gon, also known as an octadecagon, has 18 sides. To find the number of triangles in an n-gon, you can use the formula (n-2)C3, where C represents a combination. Plugging in n=18, we get (18-2)C3 = 16C3 = 16! / (3!(16-3)!) = 16! / (3! * 13!) = 161514 / 321 = 560. Therefore, an 18-gon has 560 triangles.
Side-Angle-Side. It's a means to test for congruence between two triangles. If you can match the length of a side, the measure of the angle between that side and another side, and the length of that second side, then you have proven the triangles to be congruent.
A right-angle triangle will have one right-angle (90 degrees).