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○a 25° ○b 31° ○c 23° ○d 59°​
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○a 25°
○b 31°
○c 23°
○d 59°​

○a 25° ○b 31° ○c 23° ○d 59°​-example-1
User Aaron Swan
by
4.1k points

1 Answer

6 votes

Answer:

b

Explanation:

∠ BDC + ∠ ADC = ∠ ADB , substitute values

- 6x + 53 - 9x + 22 = 90

- 15x + 75 = 90 ( subtract 75 from both sides )

- 15x = 15 ( divide both sides by - 15 )

x = - 1

Then

∠ ADC = - 9x + 22 = - 9(- 1) + 22 = 9 + 22 = 31° → b

User GreenMatt
by
4.6k points
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