Find the amount for the triangle.
First, note that the angle supplement (inside the triangle) with 90° is 90°
Next, note that the angle supplement (inside the triangle) with 133° is 47°
Now, note that a triangle's total angle measurement is 180°
Solve for p: p + 47 + 90 = 180
Simplify: p + (47 + 90) = 180
p + (137) = 180
Isolate the p. Note the equal sign, what you do to one side, you do to the other. Subtract 137 from both sides
p + 137 (-137) = 180 (-137)
p = 180 - 137
p = 43
(C) 43° is your answer
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Check:
43 + 90 + 47 = 180
90 + 90 = 180
180 = 180 (True)
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