A circle graph is also known as a pie chart so the requirements are a compass, a protractor, data and converting the data into fractions of 360 degrees.
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4x<4 means x<1 If you graph this on the number lines, you need an open circle at 1 and a solid line from 1 going to the left forever.
A graph with x and y coordinates has 4 quadrants, so would be a 4 quadrant graph.
You are describing a circle, with its center at the origin and a radius of 4 (the square root of 16)
It's a circle. The equation of a circle is x^2+y^2=r^2. So the equation you've given is a circle with a radius of 4 and, since there are no modifications to the x or y values, the center of the circle is located at (0,0).
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