Measure it or check that it complies with Pythagoras' theorem.
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Measure it with a protractor.
you just have to measure it in inches all the sidesAnother Answer:-Area of a triangle = 0.5*base*height
its useful if you work as a architect
state if the three numbers can be measures of the sides of a triangle. show your work 1- 15,12,9
the other 2 angles are 45 each... its a 90, 45, 45 triangle