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The reason is: there is an obtuse angle at the top part of the
triangle, and all three sides have different measurements.
The rectangle in the lower left angle makes it RIGHT. Can you see that all three sides are different in length?
The complete triangle on the right has 3 angles. If we cut off two angles and line them up to the third angle, it creates a 180º angle.
Remember, three angles of every triangle equal 180º.
a
ab
b