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Sagot :
Answer:
4x+7x-9=90
11x-9+9=90+9
11x=99
x =9
measure of CBD=7x-9
=54
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
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