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adoni [48]
3 years ago
13

A) 90

Mathematics
1 answer:
Alenkinab [10]3 years ago
6 0
We know that AB is perpendicular to CD. (that was given) 

Perpendicular angles are 90 degrees because two straight lines (180) crossed make 4 90 degree angles. 

180+180=360

90*4=360    See the similarities?

7x+6= 90 degrees

Subtract 6 on both sides. 

7x=84

Divide both sides by 7.

x=12

"B" is the correct answer.

I hope this helps!
~kaikers

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