Area - circles, sectors and segments

There are 32 NRICH Mathematical resources connected to Area - circles, sectors and segments
Bull's Eye
problem

Bull's eye

Age
11 to 14
Challenge level
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What fractions of the largest circle are the two shaded regions?
Handy Angles
problem

Handy angles

Age
11 to 14
Challenge level
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Weekly Problem 39 - 2008
How big is the angle between the hour hand and the minute hand of a clock at twenty to five?