Respuesta :

senalvidun

Answer:

4x+7x-9=90

11x-9+9=90+9

11x=99

x =9

measure of CBD=7x-9

=54

bhadelsimron19

Answer:

Step-by-step explanation:

7x-9+4x=90 degree ( being perpendicular)

11x=90+9

x=99/11

x=9

Angle CBD=7x-9

=7*9-9

=63-9

=54 degree