In triangle , if , then is equal…

MATHEMATICS · Multi correct · GCSE · Mathematics · Geometry and Measures · Geometry and Measures

Problem

In triangle ABCABC, if 2a2b2+2b2c2=a4+b4+c42a^2b^2+2b^2c^2=a^4+b^4+c^4, then ∠B\angle B is equal to: (1) 45∘45^\circ (2) 135∘135^\circ (3) 120∘120^\circ (4) 60∘60^\circ

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