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All the angles within the triangle must still always add up to 180 degrees, but in a scalene triangle none of the angles can be of the same size.
When one of the angles in a scalene triangle is
exactly 90 degrees this triangle is said to be a right-angled triangle.
Right-angled triangles are a 'special case' of
triangle and have a relationship between the lengths of their individual sides, this is called THE
PYTHAGOREAN THEOREM. More can be found about this theory, and others by following the
links from this web-site.
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