Step-by-step explanation:
Two angles are called supplementary when their measures add up to 180 degrees.
<ADB + <BDC = 180°
IT'S seen that BOTH ADB and BDC are 90 degrees
90+90= 180
Answer: 10
the distance between 2 points is 
Step-by-step explanation:
The first one is no solution, the second one is t+x=y