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hammer [34]
3 years ago
12

I need help to figure this out?can someone help me?

Mathematics
1 answer:
prisoha [69]3 years ago
8 0
The definition of an angle bisector is a bisector that cuts an angle into two equal halves.

So BD bisects ∠ABC, therefore ∠ABD = ∠DBC

We can set the expressions inside them equal to each other, solve for x, and substitute it into the expressions again to find the total value of the angle.

4x - 15 = 3x + 12
- 3x         - 3x
______________
x - 15 = 12
   + 15   + 15
______________
x = 27

So x = 27, we can plug this back into an expression and do the same with the second one and add them, or, because we know they are equal, just multiply two once we find the value of the first one. 

4(27) - 15
= 108 - 15
= 93

Multiply 93 by 2.
93 x 2 = 186

Therefore m∠ABC is 186°

Hope this helps! :)
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