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Home > GC > Chapter 1 > Lesson 1.3.3 > Problem 1-124


Rosalinda examined the angles below and wrote the equation .

  1. Does her equation make sense? If so, explain why her equation must be true. If it is not correct, determine what is incorrect and write the equation.

  2. If you have not already done so, solve her equation, clearly showing all your steps. What are the measures of the two angles?

  3. Verify that your answer is correct.

    Is a right angle (as illustrated above), equal to ?

    Yes. This means Rosalinda's equation makes sense, because the two angles make up a angle.

    Refer to the Math Notes box in section 1.1.4 if you need help remembering how to solve a linear equation.

    After solving for , insert your answer into the original equation to verify it is correct.