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.4اذا ﺗﻄﺎﺑﻘﺖ اﺿﻼع اﻟﻤﺜﻠﺚ ﻓﺎن اﻟﺰواﯾﺎ ﻣﺘﻄﺎﺑﻘﮫ = 60
ﻣﺜﻠﺚ ﻗﺎﺋﻢ اﻟﺰاوﯾﮫ :
.1ﻣﺒﺮھﻨﺔ ﻓﯿﺘﺎﻏﻮرس ﻣﺴﺎﺣﮫ اﻟﻤﺮﺑﻊ اﻟﻤﻨﺸﺄ ﻋﻠﻰ اﻟﻮﺗﺮ = ﻣﺠﻤﻮع
ﻣﺴﺎﺣﺘﻲ اﻟﻤﺮﺑﻌﯿﻦ اﻟﻤﻨﺸﺄﯾﻦ ﻋﻠﻰ اﻟﻀﻠﻌﯿﻦ اﻻﺧﺮﯾﻦ .
)طﻮل اﻟﻮﺗﺮ() = 2طﻮل اﻟﻀﻠﻊ اﻻول() + 2طﻮل اﻟﻀﻠﻊ اﻟﺜﺎﻧﻲ(2
ﺛﻼﺛﯿﮫ ﻓﯿﺘﺎﻏﻮرس :ﻻﺛﺒﺎت ان اﻟﻤﺜﻠﺚ ﻗﺎﺋﻢ ﻧﺮﺑﻊ ﺛﻢ ﻧﻘﺎرن .
