Twoafros@lemmy.world to No Stupid Questions@lemmy.world · 10 months agoMath question: how do we get an irrational number pi from the ratio of circumference and the diameter of a circle?message-squaremessage-square42fedilinkarrow-up149arrow-down13file-text
arrow-up146arrow-down1message-squareMath question: how do we get an irrational number pi from the ratio of circumference and the diameter of a circle?Twoafros@lemmy.world to No Stupid Questions@lemmy.world · 10 months agomessage-square42fedilinkfile-text
minus-squareSkyezOpen@lemmy.worldlinkfedilinkarrow-up2·10 months ago If you were to cut a string to the length of your circle’ diameter, it WILL ALWAYS wrap around by 3.14159 (or π times). Isn’t that backwards?
minus-squareAlteon@lemmy.worldlinkfedilinkarrow-up3arrow-down1·10 months agoNope. The equation is P=πD. Meaning the Perimeter is equal to 3.14 times the length of your Diameter. You can visualize it here: https://m.youtube.com/watch?v=1lQfERPjkzk
minus-squareSkyezOpen@lemmy.worldlinkfedilinkarrow-up2·10 months agoRight, so you’d need 3.14 strings of length D to cover the circle, D wouldn’t wrap around it itself.
minus-squareAlteon@lemmy.worldlinkfedilinkarrow-up3arrow-down1·10 months agoIt was implied that it would wrap around the circle. I’ll update original post to clarify better.
minus-squareSkyezOpen@lemmy.worldlinkfedilinkarrow-up3·10 months agoYeah that’s what I gathered, but it’s backwards. C = Pi D means you need pi strings, not that it’ll cover the circle pi times.
minus-squareAlteon@lemmy.worldlinkfedilinkarrow-up4·10 months agoAhhhh. I see what your saying. It’s fixed. Yeah. Did not mean to intend that it wraps fully around the circle pi times. Good catch.
Isn’t that backwards?
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Nope.
The equation is P=πD. Meaning the Perimeter is equal to 3.14 times the length of your Diameter.
You can visualize it here: https://m.youtube.com/watch?v=1lQfERPjkzk
Right, so you’d need 3.14 strings of length D to cover the circle, D wouldn’t wrap around it itself.
It was implied that it would wrap around the circle. I’ll update original post to clarify better.
Yeah that’s what I gathered, but it’s backwards. C = Pi D means you need pi strings, not that it’ll cover the circle pi times.
Ahhhh. I see what your saying. It’s fixed.
Yeah. Did not mean to intend that it wraps fully around the circle pi times. Good catch.