Characteristics of the four quadrants:
- Quadrant I: X is Positive, Y is Positive
Quadrant II: X is Negative, Y is Positive
Quadrant III: X is Negative, Y is Negative
Quadrant IV :X is Positive, Y is Negative
Characteristics of four quadrants
Rarely Tested
Question 1
Find the number of points with integral coordinates which lie in the region enclosed by |x|+|y| = 4 or on the boundary.
Question 2
Find the number of integral points (x,y) that satisfy $$\frac{x^2}{16}+\frac{y^2}{25} \leq 1$$
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