Can You Solve These Circle Area Challenge Questions?

Today we're going over the basics of circles and area and then using them to answer three challenge problems. Try the problems on your own first, and see how you do. Feel free to ask questions if anything still confuses you. These types of questions you'll see on the SAT, GRE, and ACT, among others. Plus they're a good mental workout. Enjoy!
Like usual, if you have feedback , leave them in the comments. I'd love to hear from you. We're all always learning.
0:00 Introduction and Definitions
1:22 Warm-ups
3:28 Challenge 1
5:13 Challenge 2
8:02 Challenge 3

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