1. Find something that is 4 cm in diameter (or slightly smaller) and draw around it
2. Use a compass set to a radius of 2 cm
3. Use a drawing program and set the circle properties so that it has a diameter of 4 cm
4. Use metric graph paper and plot the graph of x2 + y2 = 4. (1 unit = 1 cm)
_____
4 cm is about 1.575 inches, so 2 cm is about 0.787 inch.
2. Use a compass set to a radius of 2 cm
3. Use a drawing program and set the circle properties so that it has a diameter of 4 cm
4. Use metric graph paper and plot the graph of x2 + y2 = 4. (1 unit = 1 cm)
_____
4 cm is about 1.575 inches, so 2 cm is about 0.787 inch.