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‫اﻟﺰاوﯾﮫ اﻟﺨﺎرﺟﯿﮫ ﻟﻠﻤﺜﻠﺚ = ﻣﺠﻤﻮع ﻗﯿﺎس اﻟﺰاوﯾﺘﯿﻦ اﻟﺪاﺧﻠﯿﺘﯿﻦ‬
                                                 ‫اﻟﺒﻌﯿﺪﺗﯿﻦ ‪.‬‬

                                       ‫‪160 = 80+70=X‬‬

‫* ﻣﺠﻤﻮع ﻗﯿﺎس اﻟﺰواﯾﺎ اﻟﺨﺎرﺟﯿﮫ ﻟﻠﻤﺜﻠﺚ = ‪ 360‬ﺑﻨﻔﺲ اﻻﺗﺠﺎه‬
               ‫* ﻣﺠﻤﻮع ﻗﯿﺎس اﻟﺰواﯾﺎ اﻟﺪاﺧﻠﯿﮫ ﻟﻠﻤﺜﻠﺚ = ‪180‬‬
                      ‫اﻋﺪاد اﻟﻄﺎﻟﺒﮫ ‪ :‬ﺳﻨﺪس اﺣﻤﺪ ﺧﻀﯿﺮات ‪.‬‬
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