What is an obtuse angle on a right-angled triangle called? Why does it exist if there are no obtuse angles in triangles at all? - Quora

How to distinguish if a triangle is right angled, obtuse or acute on the basis of sides - Quora

What is an obtuse angle on a right-angled triangle called? Why

Do right triangles always contain one right-angle, two acute angles, and one obtuse angle? How would you prove that such triangles don't exist if they don't? - Quora

Do trigonometric functions only work for right triangles? - Quora

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Can a triangle have 2 obtuse angles? Why or why not? - Quora

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How to prove that an obtuse angled triangle has no right angles - Quora

How many types of triangles are there in geometry? What are they called (e.g., obtuse, scalene, equilateral)? - Quora