paustin28
18.08.2019 •
Mathematics
Asquare has a perimeter of 8 cm. what is its area?
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Ответ:
Ответ:
v = π r² h/3
since the slant length is given, we need to solve for the height. in a right triangle the slant length is the hypotenuse and the given radius serves as the short leg. we use the pythagorean theorem to solve for the height.
a² + b² = c²
a² + 8² = 17²
a² = 17² - 8² = 289 - 64
a² = 225
a = √225 = 15
volume of oblique cone= π * 8² * 15/3 = π * 64 * 5 = 320π cubic units
volume of cylinder = π r² h = π * 8² * 15 = π * 64 * 15 = 960π cubic units
volume of unfilled portion of the cylinder:
960π cubic units - 320π cubic units = 640π cubic units. choice c.