Answer:
1. 13
2. 3.14 (estimation: 3)
3. 14
Explanation:
So, if each square represents 1 square inch, then you know that the big square equals 5x5 square inches, or 25 square inches. So, for the first problem, you can subtract 25 by 12, because we know that the white squares sum to 12. For question 2, the formula to find the area of a circle is pie*radius^2, so we get 3.14*1^2, which is 3.14. For number 3, we can simply count the shaded squares, and you get 14.