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### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Estimating Angles

Use the GeoGebra applet below to explore angles.

Tick and untick the box to show/hide the angle and challenge yourself to make different angles.

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### Clock Hands

### On Time

### Watch the Clock

Links to the University of Cambridge website
Links to the NRICH website Home page

Nurturing young mathematicians: teacher webinars

30 April (Primary), 1 May (Secondary)

30 April (Primary), 1 May (Secondary)

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Use the GeoGebra applet below to explore angles.

Tick and untick the box to show/hide the angle and challenge yourself to make different angles.

This investigation explores using different shapes as the hands of the clock. What things occur as the the hands move.

On a clock the three hands - the second, minute and hour hands - are on the same axis. How often in a 24 hour day will the second hand be parallel to either of the two other hands?

During the third hour after midnight the hands on a clock point in the same direction (so one hand is over the top of the other). At what time, to the nearest second, does this happen?