PLEASE HELP!! Quadrilateral ABCD is inscribed in circle O as shown below.

Which of the following would be used to find the m∠3?

A. 90°+m∠4

B. 180°−m∠1

C. 270°+m∠2

D. 360°−(m∠1+m∠2)

A. 90°+m∠4

Step-by-step explanation:

Also  

∠ A + ∠ C = 180  o = ∠ B + ∠ D

⇒ 2 x+ ( 3 x − 5 ) = 180  0 = ( x + 5 ) +  ∠  C

5 x  −  5  =  180

Add 5 to both sides

5 x  =  185

Divide both sides by 5

x =  185  5  =  37

But it was A. 90°+m∠4

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step-by-step explanation:

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step-by-step explanation: