# Resources tagged with: Cartesian equations of circles

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There are 6 NRICH Mathematical resources connected to Cartesian equations of circles, you may find related items under Coordinates, Functions and Graphs.

Broad Topics > Coordinates, Functions and Graphs > Cartesian equations of circles ### Curved Square

##### Age 16 to 18 Challenge Level:

Can you find the area of the central part of this shape? Can you do it in more than one way? ### Orthogonal Circle

##### Age 16 to 18 Challenge Level:

Given any three non intersecting circles in the plane find another circle or straight line which cuts all three circles orthogonally. ### Baby Circle

##### Age 16 to 18 Challenge Level:

A small circle fits between two touching circles so that all three circles touch each other and have a common tangent? What is the exact radius of the smallest circle? ### Rational Round

##### Age 16 to 18 Challenge Level:

Show that there are infinitely many rational points on the unit circle and no rational points on the circle x^2+y^2=3. ### Square Pair Circles

##### Age 16 to 18 Challenge Level:

Investigate the number of points with integer coordinates on circles with centres at the origin for which the square of the radius is a power of 5. ### Ellipses

##### Age 14 to 18 Challenge Level:

Here is a pattern for you to experiment with using graph drawing software. Find the equations of the graphs in the pattern.