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០៩២ ៧៧៤៤៤០ ឆន ំសិក ២០១៦-២០១៧<br />
1 <br />
AE AC AG BA<br />
2 <br />
<br />
<br />
<br />
េ្រពះ<br />
<br />
AE BA 0 និង<br />
<br />
AG AC 0<br />
1 1 <br />
<br />
2 2<br />
AE AC AG AB AE AC cos EAC AG BAcos<br />
BAG<br />
1<br />
2<br />
<br />
AE AC cos EAC cos BAG<br />
<br />
<br />
េយ<br />
EAC EAG 90<br />
EAG EAB BAG<br />
នំឱយ េគបន<br />
<br />
AM BC<br />
0<br />
េនះ<br />
AM<br />
BC<br />
ដូចេនះ<br />
AM<br />
BC<br />
។<br />
៧៤. ក). ្រយបំភ្លឺថ៖<br />
<br />
GB GC 2 GA', GA GB GC<br />
0<br />
េយើងបន<br />
<br />
GAGB BA<br />
និង<br />
<br />
GAGC CA<br />
នំឱយ<br />
<br />
2GA GB BAGC CA<br />
េយ<br />
A<br />
ជចំណុ ចក្ដ លៃន<br />
BC<br />
េនះ<br />
<br />
BACA<br />
េនះេយើងបន<br />
<br />
2GA GB GC<br />
េរៀបេរៀងេយ៖ ЯĊŲ Ю₤₣lН₣ Page 116
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