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០៩២ ៧៧៤៤៤០ ឆន ំសិក ២០១៦-២០១៧<br />
<br />
ខ). គណនផលគុណក ែល CACB<br />
េយើងមន<br />
<br />
CACB CA CB cos ACB<br />
<br />
មរូប CA AC 3, CB BC 1<br />
<br />
និង ACB 90<br />
<br />
េយើងបន CACB CA CB cos ACB 3 1cos90 0<br />
ឯក<br />
<br />
ដូចេនះ CACB<br />
0<br />
ឯក ។<br />
<br />
គ). គណនផលគុណក ែល AB<br />
BC<br />
េយើងមន<br />
<br />
AB BC AB BC cos ABC<br />
<br />
េយ AB 2, BC 1<br />
<br />
និង ABC 60<br />
េយើងបន<br />
<br />
1<br />
AB BC AB BC cos ABC 21 1ឯក<br />
2<br />
<br />
ដូចេនះ AB BC<br />
1<br />
ឯក<br />
<br />
ឃ). គណនផលគុណក ែល ABCA<br />
េយើងមន<br />
<br />
AB CA AB CA cosCAB<br />
<br />
េយ AB 2, CA AC 3<br />
<br />
និង CAB 30<br />
េរៀបេរៀងេយ៖ ЯĊŲ Ю₤₣lН₣ Page 59
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