Hello :
<span>(x² - 4x )+( y² - 4y) - 73 = 0
</span>(x² - 4x+4-4 )+( y² - 4y+4-4) - 73 = 0
(x² - 4x+4)-4 +( y² - 4y+4)-4 - 73 = 0
(x-2)² +(y-2)² = 9²
<span>the radius is : 9</span>
5
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HERE IS UR ANSWER
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The volume of a sphere is 2/3 of the volume of a cylinder with same radius, and height equal to the diameter. The volume V of a sphere is four-thirds times pi times the radius cubed. The volume of a hemisphere is one-half the volume of the related sphere.
Parallel because they both have no slope meaning the are both horizontal lines.