You are Here: Home >< Maths

# polygons watch

1. how do you work it out , I've drew on the angle by the way

2. (Original post by Wildnatxox)
how do you work it out , I've drew on the angle by the way
All the blue ones add up to (...), and since there's (...) of them, a single one is (...)

3. (Original post by RDKGames)
All the blue ones add up to (...), and since there's (...) of them, a single one is (...)

360 divided by 8 ?
4. (Original post by Wildnatxox)
360 divided by 8 ?
Yep.

Now have a go at part (b)
5. (Original post by RDKGames)
Yep.

Now have a go at part (b)
is it (8-2) x 180

answer divided by 8 gives you how much is each interior angle

Then since it's A , B , C

You just add the three interior angels together?
6. (Original post by Wildnatxox)
is it (8-2) x 180

answer divided by 8 gives you how much is each interior angle

Then since it's A , B , C

You just add the three interior angels together?
No. When it says "Angle ABC" it does not mean you add up the angles A+B+C. What it means is that if you connect with a straight line the points A and B, then B and C, the angle they're referring to is the one that is created between the two lines.

Applying it to this question, angle ABC is referring to one of the interior angles. You found its size, so question done.
7. (Original post by Wildnatxox)
how do you work it out , I've drew on the angle by the way

Ratherthan trying to remember the sum of the internal angles it is MUCH easier to remember external angles always add to 360. Try this approach.
8. (Original post by RDKGames)
All the blue ones add up to (...), and since there's (...) of them, a single one is (...)
This is not the advised approach to such questions.
9. (Original post by Muttley79)
This is not the advised approach to such questions.
OK.

I bet creative approaches are not advised at GCSE either?

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: March 9, 2018
Today on TSR

### He lied about his age

Thought he was 19... really he's 14

### University open days

Wed, 25 Jul '18
2. University of Buckingham
Wed, 25 Jul '18
3. Bournemouth University
Wed, 1 Aug '18
Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams