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You Rit. We also can use similar tringles and ...getting h(r-h)=
jinjing
2011-08-15 16:44:33
( reads)
跟帖(2)
jinjing
2011-08-15 17:31:02
(R+r-h)^2=(R+r)^2-R^2-h^2,...
jinjing
2011-08-15 17:33:49
Sorry, It should be: (R+r-h)h=(R+r)^2-R^2-h^2,...
jinjing
2011-08-15 17:31:02(R+r-h)^2=(R+r)^2-R^2-h^2,...