Which best describes this triangle? a. all sides are different lengths; one angle is obtuse. b. all sides are equal; all angles are less than 90°. c. two sides are equal; all angles are acute. d. two sides are equal; one angle is obtuse.

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the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation: