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The largest angle is
It is a right angle triangle and its largest angle is 90 degrees
largest is lies opposite to the largest side , so the largest angle is the angle which is opposite to the 23.8cm side. let a=11.3 ,b=23.8 and c=21.7 ,then the largest angle cosB=(a2+c2 -b2)/2ac ,here the largest angle is B
An obtuse angle
Because in second angle both quaderent comes negative that's why we cant use second angle method