Why is maths most important than any other subject?
2 answers:
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Answer:
60°
Step-by-step explanation:
sum of interior angles of quadrilateral is 360°
∠C = 70°
∠D = 50°
∠C + ∠D = 120°
∴ ∠A + ∠B = 360° - 120° =240°
AO and BO bisect ∠A and ∠B
∠OAB + ∠OBA = 1/2 x ( ∠A + ∠B) = 120°
∠AOB = 180° - (∠OAB + ∠OBA) = 180° - 120° = 60°
Answer: Second Option
Step-by-step explanation:
We have the following expression:
We have the following expression:
To solve the expression, apply the inverse of on both sides of the equality.
Remember that:
So we have to:
The answer is the second option