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Re: [MATH/Phys.] Equili. & Opt.

Hallo ba'c A'i Vie^.t,ba'c Hu`ng et al,

trong tru+o+`ng ho+.p tam gia'c thi` <AMB = <BMC =<CMA =120. Co`n
trong tru+o+`ng ho+.p tu+' gia'c kho^ng nha^'t thie^'t ca'c go'c
pha?i ba(`ng 90 (die^?m M pha?i ti`m la` giao ddie^?m cu?a 2 ddu+o+`ng
che'o). Trong tru+o+`ng ho+.p to^?ng qua't co' le~ pha?i gia?i he^.
2 phu+o+ng tri`nh cho 2 to.a ddo^. cu?a M.

Question to a. A'i Vie^.t : He^. tho^'ng ca^n ba(`ng co' na(ng lu+o+.ng
nho? nha^'t la` 1 dinh ly' hay tie^n dde^` trong va^.t ly'? Ne^'u la`
di.nh ly' thi` co' ca'ch gia?i thi'ch na`o de^~ hie^?u cho dummies kho^ng?

Cheers,
	Vu~