CPM Homework Help : CCG Problem 5-82

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

$4x+2^\circ+9x-3^\circ=90^\circ$

$4x+2^\circ=9x-3^\circ$

$4x+2^\circ+9x-3^\circ=180^\circ$

$(4x+2^\circ)(9x-3^\circ)=90^\circ$

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.

Hint:

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