This is a fun and simple trigonometry challenge.
No calculators allowed!
Which of the following is the largest?
(a) 
(c) 
There are a couple of nice ways to solve this without using a calculator, and plenty of good ways to extend this question.
The real challenge is to come up with your own version of this problem!
Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network. My latest contribution, a Test Yourself quiz-question, can be found here:
https://learning.blogs.nytimes.com/2012/04/30/test-yourself-math-april-30-2012/
This question is based on rapid population growth in African countries. How long will it take Nigeria’s population to quadruple?
Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network. My latest contribution, a Test Yourself quiz-question, can be found here:
https://learning.blogs.nytimes.com/2012/04/25/test-yourself-math-april-25-2012/
This question is based on the increasing number of Chinese tourists visiting the United States each year. Just how much are they spending?
Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network. My latest contribution, a Test Yourself quiz-question, can be found here:
https://learning.blogs.nytimes.com/2012/04/16/test-yourself-math-april-16-2012/
This question is based on the current oil-export capacity of Iran. How long would it take Iran to export a billion dollars’ worth of oil?
Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network. My latest contribution, a Test Yourself quiz-question, can be found here:
https://learning.blogs.nytimes.com/2012/04/02/test-yourself-math-april-2-2012/
This question is based on Fred Newman’s world record of 20,371 free throws in 24 hours. How fast was he making those shots?
