How to Draw a Perfect Circle on a Whiteboard

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   Cut string that's 1–2 inches (2.5–5.1 cm) longer than your desired radius. The circumvolve you draw will have a diameter that'southward twice as long every bit the string you use, only you should cut it 1–2 inches (2.5–5.1 cm) longer than you want at first since you'll lose some of the length when you necktie a loop at each stop.^[1]

   • For example, if you want your circumvolve to be 4 inches (10 cm) across, and then your desired radius would exist ii inches (5.i cm) since the radius is equal to one-half of the diameter. Therefore, you'd cut the slice of string to be about 3–iv inches (7.6–10.2 cm) long and so you lot have extra cord on each end to tie the loops with.

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   Tie a small loop at each end of the cord. Yous'll use one of the loops to attach the string to a pivot and the other loop to adhere it to a pencil. The size of the loops doesn't need to be precise, but brand sure they're large plenty to fit around a pencil and pin but non so big that they use upwards a lot of the string that yous cut.^[2]

   • When you lot're finished tying the loops, yous tin can measure out the length of the string to decide what the exact radius of your circumvolve will exist. If the radius is too short, you can always cut a longer piece of string and try again.

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   Place a piece of paper over some cardboard, styrofoam, or cork board. Any kind of textile will piece of work as long equally you're able to press a pin into information technology. This base under the paper will give the pin something to stick into and assistance agree information technology in place every bit you apply it to draw your circle.

   • If you lot're drawing your circumvolve onto a piece of thick material, like foam poster board or canvas, you can skip this footstep.
   • If you don't have annihilation to use every bit a base of operations under your sheet of paper, you can endeavour holding the pin in place on the paper with your fingers instead.

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   Push a pivot through the paper where you lot want the center of your circle to be. Whatever kind of push button pin will work, although the shorter the pin, the easier it will be to piece of work with (since a tall pin might stick upward more and be less stable). Make certain it's non too close to the border of the paper or else your circle might go off the folio when you draw it.^[3]

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   Loop i cease of the cord over the pin. Don't worry about tightening the loop. As long equally it's wrapped around the pin, you're all set.^[4]

   • It doesn't matter what stop of the string you wrap effectually the pivot. Just brand sure the loop on the other end is big enough to wrap effectually a pencil.

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   Loop the other end of the string around the end of a pencil. Simply slide the tip of the pencil into the loop so the string is wrapped around the pencil. Information technology's OK if the loop slides down the pencil. You'll be pulling it taut later on so it stays in place.^[5]

   • You don't have to use a pencil to draw your circle—you lot can use a pen, marker, colored pencil, or another cartoon utensil as long as the loop fits around it.

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   Place the tip of the pencil on the paper so the string is pulled taut. Pull the pencil away from the pin until the string is completely taut. And then, place the tip of the pencil down. This is where the border of your circle will be.^[6]

   • Don't pull on the cord too hard or you could pull the pin out.

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   Draw a circle with the pencil, keeping the string taut as y'all become. To draw your circle, slowly move the pencil in a circular move around the pivot in the eye, holding the pencil up directly and non at an bending. Keep gently pulling the pencil abroad from the pin in the center so that the string stays taut and your circle is even all the mode around.^[7]

   • If y'all don't go on the cord taut, yous won't finish up with a perfect circle. If your paw slips and you make a mistake, just erase what you lot've drawn and beginning over.

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   Remove the pin when you're finished drawing your circle. If you lot want to depict another circle, y'all tin push the pivot into a different spot on the paper and repeat the process. Otherwise, set the pin and string aside for the next time you need to draw a perfect circle!

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Things Y'all'll Need

• Newspaper
• Pencil
• Cord
• Scissors
• Pin
• Paper-thin, styrofoam, or cork board

About This Article

Article Summary Ten

To draw a perfect circle using a pin, starting time by cut a piece of cord that's 1 to ii inches longer than your desired radius and tying a modest loop at each end. Then, identify a slice of paper over some cardboard or styrofoam, push a pin through the center of the paper, and loop 1 end of the cord over the pin. Next, loop the other end of the string effectually the end of a pencil, and pull the pencil away from the pin so the string is completely taut. Finally, identify the tip of the pencil on the paper and draw a circumvolve, keeping the string taut as you get. To learn more, including how to keep the pin in place if y'all don't have any cardboard or styrofoam, keep reading.

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Source: https://www.wikihow.com/Draw-a-Perfect-Circle-Using-a-Pin

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