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# Everything i've been taught is a lie watch

1. There are triangles that add up to more than 180 degrees.

Is anything sacred?
2. But the earth is flat innit.
3. Most stuff at GCSE is simplified, so it can lead to assumptions which are not true. At A Level you learn in detail and at university you learn in even more detail. It's a bit like teaching a 5 year old positive numbers and them assuming that's all the numbers in the world....then they find out there are negative numbers...then they find out there are imaginary numbers (square root of -1 is i, which is an imaginary number).
4. (Original post by chazwomaq)
But the earth is flat innit.
Is that what they teach in psychology lectures these days?
5. (Original post by ma_long)
Most stuff at GCSE is simplified, so it can lead to assumptions which are not true. At A Level you learn in detail and at university you learn in even more detail. It's a bit like teaching a 5 year old positive numbers and them assuming that's all the numbers in the world....then they find out there are negative numbers...then they find out there are imaginary numbers (square root of -1 is i, which is an imaginary number).
I'm at A level and I still think that all the angles in a triangle add up to 180 degrees
6. (Original post by G.Y)
I'm at A level and I still think that all the angles in a triangle add up to 180 degrees
I'm pretty sure angles in a triangle do add up to 180
7. (Original post by ma_long)
I'm pretty sure angles in a triangle do add up to 180
Only on Euclidean surfaces.
8. (Original post by tashkent46)
Only on Euclidean surfaces.
Yeah but then how is it a triangle, surely it is a 3d object then?
9. (Original post by ma_long)
Yeah but then how is it a triangle, surely it is a 3d object then?
Spherical geometry. Imagine a huge triangle drawn on the the earth. It's still 2D but it's not the same as a triangle drawn on a flat plane.
10. You have only been taught that triangles angles add up to 180 degrees?
11. (Original post by monkeyman0121)
You have only been taught that triangles angles add up to 180 degrees?
Didn't do maths after GCSE, pretty shocking how little we actually know from school.
13. (Original post by chazwomaq)
Spherical geometry. Imagine a huge triangle drawn on the the earth. It's still 2D but it's not the same as a triangle drawn on a flat plane.
Oh I see what you mean, but it seems very unnecessary to know at GCSE or A level

And it's not technically 2D since you could have a value for the depth of the corners of the triangle from the middle?

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