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Who knows answer to this?

Who knows answer to this?-example-1

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50 degrees.
A triangle in total (with all angles) adds up to 180 degrees.
A right angle (the little box in the corner of the triangle) adds up to 90 degrees.
The angle in the top corner is 40 degrees.
Add 40 + 90 = 130
Subtract 180 - 130 = 50
So in conclusion, it’s 50 degrees.
User Marian I
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