Doctor Who

Adventures in Space and Time.

On TV

All upcoming (1 new and 3 repeats)

Buy online

Where to buy

Available on:

DVD, Blu-ray, CD, Video download, Audio download

From suppliers:

Amazon, Audible.co.uk, BBC Shop, iTunes

Watch Doctor Who Extra: Episode 10

Doctor Who Extra: In the Forest of the Night

Step further into the Forest of the Night with Peter Capaldi and the team…

Play The Doctor and the Dalek

The Doctor and the Dalek

Have a go at the brilliant, brand new, online Doctor Who game!

How do we find the value of X?

Can you do better than Ruby? When X is an acute angle in a right-angled triangle, how do we find its value?
Loading...

Here are the results:

  • X = 90 minus the value of the opposite angle.

    53%
    53%
  • X = 180 minus the value of the opposite angle.

    27%
    27%
  • X = 360 minus the value of the opposite angle.

    6%
    6%
  • I’m with Ruby. I haven’t a clue.

    14%
    14%