Count 'em All 3!
Probability
Level
2
Count the number of unit squares in the irregular grid above.
Clarifications:
- Unit square is a square with side 1.
This is one part of Quadrilatorics .
The answer is 393.
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1 solution
We'll divide the grid into 2 parts:
Hence, the number of unit squares in the original grid is equal to the sum of the number of unit squares in A and B, which is
1
3
×
2
1
+
1
2
×
1
0
=
3
9
3
.