Reflect shape A in the line y = x.
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▹ Answer
<em>12</em>
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▹ Step-by-Step Explanation
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Hi!
We can see the river is a straight line.
This means that the angles that fall upon it are supplementary angles, and will add up to 180 degrees.
Therefore:
Combine like terms:
Subtract 21 from both sides:
Divide both sides by 3:
Therefore, the value of x is 53 degrees.