Answer:

Step-by-step explanation:
In the circumference, 27 represents the diameter, and the radius is <em>half</em><em> </em>the diameter, so take half of it to get 11,5. Then use it in the area formula:

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Yes, the bisecting line will also bisect the side
Answer: 12.5%
Step-by-step explanation:
80x 12.5%=10
80+10=90