Take the Right Angle
Abby, Antony, James and Peter from Gateway school in Carterton wrote to say:
We found 22 right angles in 12 hours. All the right angles are listed below:
12:16 12:49 1:22 1:54 2:27 3:00 3:33 4:05 4:39 5:11 5:44 6:16 6:49 7:22 7:54 8:27 9:00 9:33 10:05 10:39 11:11 11:44.
One of these is a minute out according to the NRICH clock. Can you find which one?
William and Alex at Maadi British International School, Cairo used a wrist watch to work out the problem and agreed there were 22 right angles, so did Eliza and Milli from St Hilda's School.
You may also like
Times
Which times on a digital clock have a line of symmetry? Which look the same upside-down? You might like to try this investigation and find out!
Clock Hands
This investigation explores using different shapes as the hands of the clock. What things occur as the the hands move.
Ten Green Bottles
Do you know the rhyme about ten green bottles hanging on a wall? If the first bottle fell at ten past five and the others fell down at 5 minute intervals, what time would the last bottle fall down?