Open Middle®
Directions: Using the digits 1 to 9, at most one time each, find the equation whose solution is the largest value of x (from 0 to 360, or 0 to 2π).
Hint
What numbers will give you the smallest value of x?
What numbers would be best to avoid?
What quadrant should your angle be in?
What numbers would be best to avoid?
What quadrant should your angle be in?
Answer
Largest:
3, 6, 9
1, 3, 4
4, 5, 9
Anywhere that the 1st number = the 3rd number minus the 2nd number
Source: Mishaal Surti