27 degrees
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63 degrees because 180 -39 -78 = 63
Angles that have a measure sum of 90.
To find the measure of angle ABD, you can add the measures of angles ABC and CBD since they share a ray. Therefore, the measure of angle ABD is 40° + 23° = 63°. Thus, the measure of angle ABD is 63 degrees.
It is: 90-27 = 63 degrees
63 degrees