0 votes 0 votes If $a, b, c$ are the sides of a triangle, and $a^2 + b^2 + c^2 = bc + ca + ab$, then the triangle is equilateral isosceles right angled obtuse angled Quantitative Aptitude cat2000 quantitative-aptitude geometry + – go_editor asked Mar 29, 2016 • edited Apr 14, 2022 by Lakshman Bhaiya go_editor 13.8k points 395 views answer comment Share See all 0 reply Please log in or register to add a comment.