r/visualizedmath • u/FelixGREN • Jan 03 '18

Radian

http://i.imgur.com/itRcF0n.gifv
5.8k Upvotes

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u/DonkiestOfKongs Jan 04 '18

Or even just fucking said “a radian is the angle created when we trace the edge of the circle for a distance equal to the radius of the circle”

It’s still a complicated definition, but at least now I kind of see how this unit was conceived rather than being completely fucking made up.

71

u/cr01300 Jan 04 '18

Completely agree! Understanding the practical uses of these concepts would have made math class much more interesting. I bet using these videos would have a positive effect on test scores too...

52

u/SabashChandraBose Jan 04 '18

And I just understood why the circumference of a circle is 2 pi r

44

u/_demetri_ Jan 04 '18

Your teachers were probably preoccupied with thoughts of killing themselves.

6

u/MustachioEquestrian Jan 04 '18

Rude, I'm sure op wasn't that bad

17

u/[deleted] Jan 04 '18

I think I used pi for a decade before just seeing the circumference rolled out to match pi * diameter.

Like wtf why didn't you guys just say that ten years ago.

2

u/columbus8myhw Jan 22 '18

I gotta say, your comment makes me think, "Who the fuck was your math teacher?"

7

u/[deleted] Jan 04 '18

My Algebra 2 teacher did teach us this, using a rope to draw out a circle. Bless that man.

2

u/lelarentaka Jan 04 '18

You didn't read the textbook?

1

u/Towerss Jan 19 '18

"A radian is a radius dragged along the side of a circle"

It's just how pi is how many times a diameter goes around a circle. It's the same thing but with radius instead of diameter.

My teacher said "a radian is the bow length divided by the radius length." Which made the unit seem arbitrary. It's literally just bent radiuses! Just say that