Question 596297
The two puzzle pieces fit together to form a right angle. In mathematics, two angles are complementary if the sum of their measures is equal to 90 degrees. A right angle has a measure of 90 degrees, so the angles of these two puzzle pieces are complementary angles.

We just need to subtract to find the missing angle measure:
90 - 47 = 43
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The angle of the other puzzle piece is 43 degrees.

That's it. Feel free to email if you have questions about this explanation.
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Ms.Figgy
math.in.the.vortex@gmail.com