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I need help understanding number 11 (picture below).

I also need a little guidance on number 10, any help is greatly appreciated.

I need help understanding number 11 (picture below). I also need a little guidance-example-1
User Hsming
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1 Answer

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For #10 all angles are right angles so 90 degrees

Therefore 3x=90
Solve for x
User Nsds
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