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What is a triangle called when none of its angles is a right angle?
AAn obtuse triangle
BA scalene triangle
CAn oblique triangle
DAn isosceles triangle
Answer & Solution
Correct answer: C. An oblique triangle
1. A right triangle has one angle of exactly 90 degrees.
2. Any triangle without such an angle is called an oblique triangle.
3. Obtuse and scalene describe only some oblique triangles, not all of them.
_Source: OpenStax Precalculus (CC BY 4.0), Ch 8 "Further Applications of Trigonometry", section 8.1 Non-right Triangles: Law of Sines_