Question

construct triangle ABC with perimeter 9.5cm and angleB=80degree, angleC=60degree

Answer 1

first we make triangle and give him sides name ABC and then we mark 80 degree on angle B and mark 60 degree at angle C we know that angle A=B=C and it's sum is 180 so

80+60=140

A+140=180

A=180-140

A=40 degree