Question

prove that the sum of angles of a triangle is 180 degree if in triangle abc , a+b=120 degree , b+c=100 degree ,find b

Answer 1

Step-by-step explanation:

b=120-a

b=100-c

120-a=100-c

20+c=a

20+c+100=180

c=60

b=100-60

b=40

a=80

a+b+c=180,b=40

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