We can solve this using an equation. Since we know that the entire angel is equal to 112, we would add the two angels together and make them equal 112.
That leaves us with the equation 6x+7+12x+3=112.
Now, just solve.
Combine like terms.
18x+10=112
Now subtract 10 on both sides.
18x=102.
To isolate x, divide both sides by 18.
X=5.66667 or 5.7.
Now that we know what x equals, we can substitute it for x in the equation for adb.
6(5.66667)+7
34+7
41.
The angle for abd is 41.
Hope this helps!
