[In a diagram, four angles are labelled A on the right-hand end, B on the middle point and C at the left-hand end. At B, a green arc marks the angle. The narrator reads out the onscreen text.]

NARRATOR: Question two. Which angle is closest to 220 degrees?

[Red crosses are drawn over the angles. The right-hand arm of each cross is marked as 0 degrees and 360 degrees and, running anticlockwise, the other arms are marked 90, 180 and 270 degrees.]

NARRATOR: Consider how each angle compares to 0 degrees, 90 degrees, 180 degrees 270 degrees or 360 degrees. The first angle clearly lies between 90 degrees and 180 degrees so is not close to 220 degrees. Similarly, the fourth diagram clearly has an angle that lies between 270 degrees and 360 degrees, so is also not close to 220 degrees. The remaining two diagrams both show angles that lie between 180 degrees and 270 degrees, so are both possibilities. Let's consider breaking these angles down a little further. If we think about the halfway point between 180 degrees and 270 degrees, we know that this is 180 plus another 45 degrees, so 225 degrees.

[Lines marking 225 degrees are drawn in diagrams 2 and 3.]

NARRATOR: If we consider this position in both diagrams, we can see that the angle in diagram 2 looks to be much closer to 225, if anything marginally less, which would be close to 220 degrees. Whereas the angle in diagram 3 is clearly quite a bit bigger than 225 degrees. So it would seem as if diagram 2 shows an angle that is closest to 220 degrees.