Mirroring the Slopes (Count 'em All 19!)
Discrete Mathematics
Level
3
A right arrow grid with base length \(2a\) is defined to be an \(a \times a\) grid cut into 2 halves diagonally, and then put together as illustrated.
What is the total number of quadrilaterals in a right arrow grid with \(a=30?\)
by
Kenneth Tan