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7-57.

Multiple Choice: Based on the relationships provided in the diagram, which of the equations below is correct? Justify your choice.

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

Triangle, with right side vertical, top right angle labeled, 4 x, + 2 degrees, bottom right angle labeled, 9 x, minus 3 degrees, each with 1 tick mark.