Answer:
This is the case ASA, with 2 triangles are congruent (ABD and CBE)
ABD = CBE because
Angle BAD = Angle BCE (as pic)
AD = CE (as pic)
Angle ADB = Angle CEB
Step-by-step explanation:
Angle ADB = Angle CEB because
ADB = 180 - BAD - B
CEB = 180 - BCE - B
BAD = BCE (as pic)
9
9v = 9(2i + 9j) = 18i + 81j
|9v | = = = 9
16
23-7=16