Answer:
D
Step-by-step explanation:
A Is incorrect since it does not show the equality
B Is incorrect since you do not comapre to 0
C is incorrect
D Is correct
39°
Angle ABD and angle CBD are complementary angles which means they complete each other to 90°
so if CBD is 51 then ABD is 90 - 51 = 39°
Here's 9 - 13. If you need any further help, I'd gladly assist.
