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  • https://math.libretexts.org/Courses/Riverside_City_College/Random_Course/1%3A_Right_Triangle_Trigonometry_Angles/1.1%3A_Angles
    In elementary geometry, angles are always considered to be positive and not larger than 360. You also learned that the sum of the angles in a triangle equals 180, and that an isoscele...In elementary geometry, angles are always considered to be positive and not larger than 360. You also learned that the sum of the angles in a triangle equals 180, and that an isosceles triangle is a triangle with two sides of equal length. Recall that in a right triangle one of the angles is a right angle. Thus, in a right triangle one of the angles is 90 and the other two angles are acute angles whose sum is 90 (i.e. the other two angles are complementary angles).

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