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I know how to find the cg of a solid by using cross section

but i just don't know how to find the cg of the cone by using the cg of a hollow cone

for eg, we can calculate the cg of the half sphere by 1. calculating the cg of the hollow half sphere, than use it to calculate the cg of solid sphere

the problem is that i can't write a equation for the dm of each hollow cone because x and y changes

i just wanna know how to do it and in fact this is not a hw question

can anyone help me plz?