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monitta
3 years ago
11

For 20points. ============ A. 25° B. 30° C. 35° D. 40°

Mathematics
1 answer:
Alex787 [66]3 years ago
8 0

Answer:

  A. 25°

Step-by-step explanation:

The angles on either side of the bisector are congruent, so ...

  (3x -5)° = (x +15)°

  2x = 20 . . . . . . . . . . . . divide by °; add 5-x

  x = 10 . . . . . . . . . . . . . .divide by 2

Substitute this result into the expression for the angle measure:

m∠BAC = (3·10 -5)° = 25°

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