In ABC,<A+<B=60 and <B+<C=140. Then <B=?
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Answered by
0
Answer:
A+B=60.......
B+C=140.......
A+B=B+C
A=B......1eq
A+B=60(a=B)
A+A=60
2×A=60
a=60÷2
a=30
a=b=30
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Answered by
0
Answer:
20°
Step-by-step explanation:
∠A+∠B=60°---------eq 1
∠B+∠C=140°--------eq2
∠A+∠B+∠C=180°--eq3
∠C=180°-(∠A+∠B)-------substitute in eq2
∠B+180°-∠A-∠B=140°
180°-∠A=140°
∠A=40°substitute in eq 1
40°+∠B=60°
∠B=20°
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