how tall was optimus prime?
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Based of the cartoon, Optimus Prime changed sizes a lot!  There was no hard/fast rule.  They simply drew him as they felt he fit in the scene.  Based on the size of the truck windows/grill front on his chest, Optimus Prime would stand roughly 50ft tall.
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5280 ft\n63360 in\n160934.4 cm
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I'm not really sure but my guess would be about 5'9.
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Well, next to me at 19 inches...\nIs John C. Holmes (he was somewhere between 12.5 and 14 inches)
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5'10" is the average size.
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Magic Johnson is 6'9"
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Most runway models are 5'9" to 5'11". However, ANTM Cycle 3 winner Eva was only 5'7" so you have a chance!
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Height: 5'7" \nWeight: 122 lbs. \n\nIf you want any other info try\nhttp://www.aishwaryaworld.com/info.html
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Alexander....Napolean was only like 5 feet tall!!!
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162.88 cm.\n75.02 qt.
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Michael "Wild Thing" Wilson, who plays for the Globetrotters and played at the University of Memphis, set the world record by dunking on a 12 foot high goal.  I seem to remember reading somewhere that his vertical was measured at 51 inches while in college, but I can't remember the source for that now.  In comparison, Michael Jordan had a verical around 46 inches in his prime.
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My friend has one it prob about 3 foot tall
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Robert Pershing Wadlow (February 22, 1918 – July 15, 1940) was and is the tallest human recorded in modern times. Wadlow reached 8 ft 11.1in (272cm) in height, it is said that he was still growing prior to his death, and 490 pounds (222 kg/35 stone) in weight before his death at the age of 22. His great size and his continued growth in adulthood were due to a tumour within his pituitary gland.
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Five foot four roughly 160cms\n\nHe was mocked for his lack of height
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Leonid Stadnik ......8 feet, 4 inches
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After much speculation, consensus is that he is most likely 6'1" tall
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Height and Weight: 6' 00 (1.83m) Weight : 78.99kg.