请问如何计算下列圆的表面积和体积 20
thetorusisadonut-shapedsolid,whichcanbethoughtofbeinggeneratedbyrotatingthefollowingc...
the torus is a donut-shaped solid, which can be thought of being generated by rotating the following circle about the y-axis. The equation of the circle is given by (x - R)^2 + Y^2 = R^2
图:http://hk.geocities.com/tweety90331/untitled.GIF
A.Find the volume of the torus
B.Find the surface area?
C.如何用Pappus's centroid theorem 解释a和b的答案?
另外其他两个问题-------
2. Find the volume of the regular tetrahedron with the side lengths a?
3. Suppose two cylinders of the same radius R meet at right angles.
a. Sketch the solid of their intersection.
b. Find the volume of the intersection. 展开
图:http://hk.geocities.com/tweety90331/untitled.GIF
A.Find the volume of the torus
B.Find the surface area?
C.如何用Pappus's centroid theorem 解释a和b的答案?
另外其他两个问题-------
2. Find the volume of the regular tetrahedron with the side lengths a?
3. Suppose two cylinders of the same radius R meet at right angles.
a. Sketch the solid of their intersection.
b. Find the volume of the intersection. 展开
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