# Points on circle

In the Cartesian coordinate system with the origin O is a sketched circle k /O; r=2 cm/. Write all the points that lie on a circle k and whose coordinates are integers. Write all the points that lie on the circle I / O; r=5 cm / and whose coordinates are integers. How many points is it?

n =  12

### Step-by-step explanation:

The equation has the following integer solutions:
x^2 + y^2 = 25

Number of solutions found: 12
##### x1=-5; y1=0x2=-4; y2=3x3=-4; y3=-3x4=-3; y4=4x5=-3; y5=-4x6=0; y6=5x7=0; y7=-5x8=3; y8=4x9=3; y9=-4x10=4; y10=3x11=4; y11=-3x12=5; y12=0

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