![Salinon](/sites/default/files/styles/medium/public/thumbnails/content-id-2425-icon.png?itok=09ypcPQx)
problem
Salinon
This shape comprises four semi-circles. What is the relationship
between the area of the shaded region and the area of the circle on
AB as diameter?
![Curvy areas](/sites/default/files/styles/medium/public/thumbnails/content-id-6468-icon.png?itok=BhJjQwuY)
problem
Curvy areas
Have a go at creating these images based on circles. What do you notice about the areas of the different sections?
![Track design](/sites/default/files/styles/medium/public/thumbnails/content-id-7359-icon.png?itok=SoM9Ko59)
problem
Track design
Where should runners start the 200m race so that they have all run the same distance by the finish?
![Arclets](/sites/default/files/styles/medium/public/thumbnails/arclets.gif?itok=OyLIqv2Q)
problem
Arclets
Each of the following shapes is made from arcs of a circle of radius r. What is the perimeter of a shape with 3, 4, 5 and n "nodes".
![Triangles and petals](/sites/default/files/styles/medium/public/thumbnails/content-02-11-six3-icon.gif?itok=K4YCjM-x)
problem
Triangles and petals
An equilateral triangle rotates around regular polygons and
produces an outline like a flower. What are the perimeters of the
different flowers?