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Find the volume of the spherical sector whose base has an altitude of 6 cm drawn on a sphere whose radius is 18 cm.
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Volume of the spherical sector is equal to V =
,
where R is the sphere radius, and h is the sector's "height".
See http://mathforum.org/dr.math/faq/formulas/faq.sphere.html.
In terms of given data, h =
=
=
=
.
Having this, you can complete calculations and solve your problem.