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Home > GC > Chapter 5 > Lesson 5.3.1 > Problem 5-72

5-72.

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

A triangle with two tick marks on two sides. The angle opposite one of the two tick mark sides is, 9 x minus 3 degrees and the other two tick mark side is, 4 x + 2 degrees.

This is an isosceles triangle, because it has two equal side lengths.
So remember in isosceles triangles base angles are equal.