Question

In ∆ABC, BC = 6 cm, C = 50° and B = 40°
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Answer 1

Answer:

∆A+∆B+∆C=sum of 3sides is 180degree

∆A+∆B+∆C=180degree

∆A+40degree+50degree=180degree

∆A+90degree=180degree

∆A=180degree-90degree

∆A=90degree