In chapter 10, circles are definitely our main focus. I've learned what an arc is, how to find certain angles, even what tangents & secants are. I've learned about inscribed and central angles and how you find those by the arc of the circle. I think engineers would really put these skills to good use on a daily basis. I still wonder... What's the difference between a secant and a normal line intersecting the circle? Is there a difference?
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