How to Measure the Circumference of a Balloon & Does Height Affect It?

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Measuring the circumference of a balloon is easy, so long as you're taking measurements from a specific location. Measure the circumference of a balloon with help from a longtime mathematics educator in this free video clip.

Part of the Video Series: Math Instruction
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Video Transcript

Hi, I'm Jimmy Chang, we're to talk about how to find the circumference of a balloon, and does height affect it? Well, the answer to the height question, the height of a balloon shouldn't really affect it. Just make sure that the balloon is in the proper place, so that you don't really affect the integrity and physical structure of the balloon. But in terms of finding the circumference of a balloon. You simply use this particular formula here, C equals two Pi-R, where R is radius of the balloon. Or, you can use C equals Pi-D, where D is the diameter of the balloon. And as you know, D is equal two times the radius. So, that's why you can make that substitution. But in that case, depends on what you're given, the radius or the diameter. You can use this, either formula to find the circumference of a balloon. Now, another way you can kind of creatively do this, if you'd like is, you can tie a string around the balloon. That's kind of a creative, hands-on way to do it. But what you want to do is, toe a string around a balloon. And then, make a mark where the string starts to overlap with the beginning of the string. And then, what you want to do is, once you make that mark, you just place piece of string that's affected, next to the ruler. And that'll give you an idea of what the circumference of the balloon is. So, that's a nice, little hands-on activity that you can figure out. So, I'm Jimmy Chang, and that's how to measure the circumference of a balloon, and does height affect it?

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