C = 7.9 x 2 x 3.14
The circumference is 49.612.
Hope this helps :)
I think this is True. Because Perpendiculer Lines Rely On Right Angles. :)
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*it's kind of hard to read the number in parenthesis though but i think it's 5
both angles have to add up to 180º because they are co-exterior angles on parallel lines.

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The graph is in the image

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It should be 10 raised to power 2 which is a hundred.