Mathematics, 07.10.2021 14:00 jaymieordonez8751

Triangle ABCABCA, B, C has the following vertices: A(1,9)A(1,9)A, left parenthesis, 1, comma, 9, right parenthesis
B(11,-7)B(11,−7)B, left parenthesis, 11, comma, minus, 7, right parenthesis
C(-9,3)C(−9,3)C, left parenthesis, minus, 9, comma, 3, right parenthesis
Is triangle ABCABCA, B, C a right triangle, and why?

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Triangle ABCABCA, B, C has the following vertices: A(1,9)A(1,9)A, left parenthesis, 1, comma, 9, r...