The perimeter of this shape is actually the same of a rectangle with sides 19 and 10.
See the attached picture: the perimeter of our shape is
Whereas the perimeter of the outer rectangle would be
So, as you can see, the only difference is that the first equation features , while the other features . This is not a problem, because is a rectangle, and thus we have and .
So, the two perimeters are actually the same:
The answer is 58. I got this question and got the answer right.
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