To measure its length, sit down and span a new piece of yarn over your thigh from the hip joint to the edge of your knee and cut the yarn there. Make an estimate. How many times would this piece of yarn go into the piece that is as long as you are tall? Can you find a way to test your estimate? There are several ways to compare the length of the two pieces of yarn: You might cut several pieces of the length of your shorter string, lay them end to end next to your longer piece, and count how many you need.
Another way is to fold the longer string into equal parts so the length of the folded string equals the length of the shorter string.
The number of folds needed is exactly the number of times your shorter string goes into your longer string. Did you see that the length of your femur bone goes about four times into your height? You can also say that if you divide your height in four equal pieces, you have the length of your femur bone, or the length of your femur bone is one fourth of your height. Mathematicians call this a one to four ratio.
How many times would the length of your head fit into your height? Maybe four, six or eight times? To test six times, fold the yarn with length equaling your height into six equal pieces. Have your helper place a book flat on your head and hang the folded string from the side of the book. If the other end of the string is about level with your chin, your height would be about six times the length of your head, or your head to body ratio would be one to six.
Which number of folds fits best for you? There are many more bodily ratios you can explore: the circumference of your head compared with your height, or the length ratios of your forearm and foot or thumb and hand.
Extra: You have explored some ratios in your body and might wonder if these hold for other people as well. Do you think they hold for most people of your age? What about adults or babies? Do you think these ratios hold for them or would some be different? Make a hypothesis, find some volunteers, measure and compare. Was your hypothesis correct? Extra : This activity uses pieces of yarn to compare lengths.
You can also measure your height, arm span, femur bone, etcetera with measuring tape, round the values and write the ratios as fractions. Can you find a way to simplify these fractions? Extra : Draw some stick figures on a sheet of paper. Can you apply some of the bodily ratios you explored like the arm span to height or the head to body ratio to the figures? Which ones look most realistic to you? Extra : Ratios are all around us.
Can you find other places where ratios play an important role? This correlation, however, decreased in perimenopausal and postmenopausal age groups. The mean differences between height and arm span were 0. Conclusion: The height and arm span were well correlated and could be used interchangeably in young women. Of course a low BMI was rated attractive, as well as a good hip-to-waist ratio. Arm span was found to be the best predictor of height.
Your arms are well developed and look impressive. If you are an adult man, it is smaller than a European or American average. People with Marfan syndrome are often tall with long, thin arms and legs and spider-like fingers called arachnodactyly.
The length of the arms is greater than height when arms are stretched out. The study looked at all kinds of body measurements among women between the ages of 20 and According to a study by online health provider Dr Felix, 24 per cent of women found the chest to be the most attractive part of a man, and 13 per cent opted for the stomach area, meaning that combined, the torso had more pulling power than any other appendage.
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