Question

Prove that the angles of a triangle is 180°,if in triangle abc, angle a +angle b =120° and angle b + angle c=100°,then find angle b

Answer 1

ABC, firstly you add angle a+angle b+angle c=180 then a+100(because b+c=100)=180, a=180-100,a=80.....(1);a+b+c=180, c+120(because a+b=120)=180,c=180-120,c=60...(2).Then we will find angle b from ...(1)and....(2), Then, In ABC (angle a=80,angle c=60 and angle b=?),therefore we have to find angle b; a+b+c=180, b+80+60=180,b=180-140,b=40; Therefore angle b=40(ANSWER). IF YOU HAVE ANY DOUGHT THAN YOU ASK ME AGIAN.
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