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7-57.
  1. Multiple Choice: Based on the relationships provided in the diagram, which of the equations below is correct? Justify your choice. Homework Help ✎

    1. 4x + 2º + 9x – 3º = 90º

    2. 4x + 2º = 9x – 3º

    3. 4x + 2º + 9x – 3º = 180º

    4. (4x + 2º)(9x – 3º) = 90º

This is an isosceles triangle because it has two congruent sides.
In an isosceles triangles base angles are equal.