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Plz answer !! I need your help​

Plz answer !! I need your help​-example-1
User Mxix
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1 Answer

2 votes

Answer:

110°

Explanation:

Angles of a quadrilateral add up to 360:

70 + 40 + ∠B + ∠O = 360

∠B + ∠O = 250

The central angle between A and C is double the angle B. And, it plus angle O add up to 360.

Therefore:

2∠B + ∠O = 360

Solve the system of equations. Subtracting the first equation from the second:

∠B = 110

User Karansardana
by
6.1k points