Here's this week's collection. Answers & extensions tomorrow. Why not discuss the problems on Twitter using #SundayAfternoonMaths or on Reddit.
Circles
Which is largest, the red or the blue area?
Largest Triangle
What is the largest area triangle which has one side of length 4cm and one of length 5cm?
Unit Octagon
The diagram shows a regular octagon with sides of length 1. The octagon is divided into regions by four diagonals. What is the difference between the area of the hatched region and the area of the region shaded grey?
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