A rectangle whose sides are 5:12 apart and a diagonal of 13 cm rotates around the larger side
January 30, 2021 | education
| A rectangle whose sides are 5:12 apart and a diagonal of 13 cm rotates around the larger side. Find the volume of the cylinder obtained by rotation.
Let the length of the smaller side of the rectangle be 5 * X cm, then the length of its larger side is 12 * X cm.
From a right-angled triangle AВD, according to the Pythagorean theorem, ВD ^ 2 = AB ^ 2 + BC ^ 2.
169 = 144 * X ^ 2 + 25 * X ^ 2.
X ^ 2 = 169/169 = 1.
X = 1.
Then AD= BC = 5 cm, AB = СD = 12 cm.
Then the radius of the cylinder is equal to AD = R = 5 cm, the height of the cylinder is equal to AB = h = 12 cm.
The volume of the cylinder is:
V = π * R2 * h = π * 25 * 12 = 300 * π cm3.
Answer: The volume of the cylinder is 300 * π cm3
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