MATH QUIZ #1 (10 Hard Math Questions and Answers) | Challenging Hard Math Quiz Game

MATH QUIZ - 10 Challenging / Hard Math Questions and Answers in 10 seconds or less.

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Hard Math Quiz Includes:
- Arithmetic (addition, subtraction, multiplication, division)
- Algebra
- Geometry
- Trigonometry
- etc.

Good luck and have fun!

Leave a comment below on how many you got!
Did you solve the bonus math question?

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** CORRECTION: (Question 8) 20.25π
I made the mistake of treating the diameter as the radius.
This problem is quite hard to mentally solve in 20 seconds without a calculator.  
(Thanks to viewer "Linda from California" for catching this mistake!)