![]() ![]() Is piece long enough, way longer or way too short? What does this tell you about how your arm span compares to your height? Let your helper span the yarn toward the tip of your right hand's middle finger. Hold one end of the piece of yarn you just cut off with the fingertips of your left hand. Your arms will be parallel to the ground. Now stretch your arms out as far as they can reach.How do you think your height compares with your arm span? Would it be similar, way longer or way shorter? Your arm span is the distance between the middle fingertips on each hand when you stretch your arms out as far as they can reach. First, we examine your arm span to height ratio.(If lying on the ground is not possible, you can also stand flat on the floor against the wall and have the book rest on top of your head and against the wall.) Now you have a piece of yarn that is as long as you are tall. Get out from under the book and, together, span the yarn across the floor from the wall to the book, cutting the yarn just where it reaches it. Look straight up and have your helper place a hardcover book flat against the top of your head, resting on the ground. The easiest way is to lie on the ground with your heels pressing against a wall. To compare the length of different parts of your body with your height, we will first create a string the length of your height. ![]() In this science activity we will examine some human body ratios and, if you like, we can explore how they can help you draw more realistic-looking figures. They are also used in the medical world a sizable deviation from a human body ratio can indicate a body that does not develop according to expectations. Wondering who would be interested in these ratios? Artists are avid users of human body ratios, because it helps them draw realistic-looking figures. There are many more human body ratios some are independent of age, and others change as we grow from a baby to an adult. This ratio is approximately a one to one ratio, meaning that a person’s arm span is about equal to their height. An example of a human body ratio is a person's arm span-the distance from the middle fingertip of the left hand to that of the right hand when stretching out both arms horizontally-to their height. Ratios compare two quantities, like the size of one part of the body to the size of another part, or to the size of the whole. Human bodies also show interesting ratios. When you draw a vertical line down the center of a body, the left and right sides are almost mirror images of each other. That is what this activity is about: recording, comparing and discovering how the human body measures up!ĭid you know that human bodies come in all sizes and forms? When you start measuring them, however, you will find our bodies show surprising similarities-and even more surprisingly, we can express these with mathematical concepts.įor one thing, our bodies are quite symmetrical. These interesting facts only reveal themselves when you look closely, measure and compare. ![]() Our bodies are amazing! They are full of mysteries and surprising facts such as this one: Did you know that you are about a centimeter taller in the morning, when you have just woken up after hours of lying down, than you are in the evening? You might never have noticed it.
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