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# Maths year 11

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1. (Original post by z_o_e)
Interior is (n-2)*180

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That's the sum, but you can directly calculate the size of the interior angles and use it to find the number of sides.
2. (Original post by B_9710)
That's the sum, but you can directly calculate the size of the interior angles and use it to find the number of sides.
What's the method to finding interior angles?

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3. (Original post by z_o_e)
What's the method to finding interior angles?

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You can fins the interior angle of tile A from this diagram and so can find the number of sides of tile A.
4. (Original post by B_9710)

You can fins the interior angle of tile A from this diagram and so can find the number of sides of tile A.
I got 120
5. Angles should add to 360 degrees, so you should get 150 degrees.
6. (Original post by z_o_e)
I got 120
If you split the angle, then you get 30 degrees inside, and then because angles on a straight line add to 180 degrees, you would get 150 degrees

You have to split the angle because, it has to be a STRAIGHT line I know it's complicated but once you get the hang of it, you'll be fine
7. (Original post by hamza772000)
If you split the angle, then you get 30 degrees inside, and then because angles on a straight line add to 180 degrees, you would get 150 degrees

You have to split the angle because, it has to be a STRAIGHT line I know it's complicated but once you get the hang of it, you'll be fine
Yasss got it.

What do I do after that?
8. (Original post by z_o_e)
Yasss got it.

What do I do after that?
You may be able to spot that the angle that is 30 degrees is actually the exterior angle of the polygon tile A.
9. (Original post by z_o_e)
Yasss got it.

What do I do after that?
YAY!
Ok, so now you have the interior angle.

btw, you didn't need the interior angle but it's good to have it because it makes it easier to understand how you got the exterior angle

Ok, so the for mula for the exterior angle is 360/number of sides.

You know that the exterior is 30 degrees, so you can rearrange the formula. So to get the number of sides the formula becomes 360/30, which equals to 12, so tile A has 12 sides

Here :
Attached Images

10. (Original post by hamza772000)
YAY!
Ok, so now you have the interior angle.

btw, you didn't need the interior angle but it's good to have it because it makes it easier to understand how you got the exterior angle

Ok, so the for mula for the exterior angle is 360/number of sides.

You know that the exterior is 30 degrees, so you can rearrange the formula. So to get the number of sides the formula becomes 360/30, which equals to 12, so tile A has 12 sides

Here :
So sorry. But just want to say I'd like to find the answer out myself as I'm trying to learn :/ and this prevents me from putting in my effort.
11. (Original post by z_o_e)
So sorry. But just want to say I'd like to find the answer out myself as I'm trying to learn :/ and this prevents me from putting in my effort.
Oh, I'm sorry, I wasn't aware of that, won't make this mistake in the future, I sincerely apologise.
12. sorry, i can't hep then. i am your age but currently doing the old gcse, as i am igcse.
13. (Original post by hamza772000)
Oh, I'm sorry, I wasn't aware of that, won't make this mistake in the future, I sincerely apologise.
It's fine x Thanks xx
14. (Original post by z_o_e)
It's fine x Thanks xx
Thanks for understanding

No worries
15. (Original post by hamza772000)
Oh, I'm sorry, I wasn't aware of that, won't make this mistake in the future, I sincerely apologise.
For this do I find the exterior angle and subtract that from 360?

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Attached Images

16. (Original post by z_o_e)
For this do I find the exterior angle and subtract that from 360?

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Nope, think again
17. (Original post by hamza772000)
YAY!
Ok, so now you have the interior angle.

btw, you didn't need the interior angle but it's good to have it because it makes it easier to understand how you got the exterior angle

Ok, so the for mula for the exterior angle is 360/number of sides.

You know that the exterior is 30 degrees, so you can rearrange the formula. So to get the number of sides the formula becomes 360/30, which equals to 12, so tile A has 12 sides

Here :
Where did you get the 30 from?

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18. (Original post by z_o_e)
Where did you get the 30 from?

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If the interior is 150, then the exterior would be......?
19. (Original post by hamza772000)
If the interior is 150, then the exterior would be......?
I don't understand.

L

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Attached Images

20. (Original post by z_o_e)
I don't understand.

L

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Yeah, but remember I told you if you SPLIT the angle in Tile B, you get the exterior angle of Tile A.

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