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If a three-sided figure (triangle) has one angle that is zero, then all angles will be zero and the three sides will be coincident, that is, they will occupy the same space and will, therefore form a single line. Such a figure would not be referred to as a triangle, and would have little practical value in trigonometry (the study of triangles).

Therefore, every triangle has three angles greater than zero degrees, whether it be isoceles, right-angled, equilateral, or any other.

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