In the diagram, line x is parallel to line y, mZ1 = 65°, and m27 = 55°. Stuart says that
m 12 = 60°. His reasoning is shown.
Step 1: mZ8 = 60°, because mZ1 + m27 + m28 = 180º.
Step 2: Z8 = 212, because 28 and Z12 are corresponding angles.
Step 3: So, mZ12 = 60°.
Use the drop-down menus to explain whether or not Stuart is correct.
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The sum of Z1, 27, and Z8 is Choose...
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angles. The measure of Z12 must be Choose...

I’m giving 80 points for this