Hello there!
We see 3 pointed dots on the line demonstrated.
For
And mainly because both and have the same length. Therefore, as we can see, would be crossing . Therefore, we would just add 18+18, or multiply 18 by 2.
Your answer: 36
I believe BC would be 36
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mainly because both 
and 
have the same length. Therefore, as we can see, 
would be crossing 
. Therefore, we would just add 18+18, or multiply 18 by 2.