In ∆ ABC , If ∠A+∠B=120° and ∠A+∠C=140°, Find ∠A
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Answer:
angle a= 80°
Step-by-step explanation:
a+b= 120°
a+c= 140°
a= ?
a+b+c =180° (the measure of triangle is 180°)
a+b+c=180°
120°+c=180°
c=180°-120°
c=60°
a+c=140°
a+60°=140°
a=140°- 60°
a=80°
a+b=120°
80°+ b= 120°
b=120°-80°
b=40°
a=80° , b=40°,c=60°
a+b+c=180°
80+60+40=180
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