You may also like

problem icon

Square Pegs

Which is a better fit, a square peg in a round hole or a round peg in a square hole?

problem icon

Floored

A floor is covered by a tessellation of equilateral triangles, each having three equal arcs inside it. What proportion of the area of the tessellation is shaded?

problem icon

Bull's Eye

What fractions of the largest circle are the two shaded regions?

Squaring the Circle

Age 11 to 14 Challenge Level:

Plenty to keep you busy here.

You can see a full quarter of the circle and you can extrapolate from this fairly accurately.