Page 135 - Engineering
P. 135
ﺍﳍﻨﺪﺳﺔ )ﺍﳉﺰء ﺍﻷﻭﻝ( ١٢٢
) [AHSME 1953] (٦١ﻳﺒﻌﺪ ﳐﻴﻢ ﺻﻴﻔﻲ ﻋﻦ ﺷﺎرع رﺋﻴﺴﻲ ﻣﺴﺘﻘﻴﻢ ﻣﺴﺎﻓﺔ
30ﻛﻢ .وﻳﻮﺟﺪ ﻋﻠﻰ اﻟﺸﺎرع اﻟﺮﺋﻴﺴﻲ ﳐﻴﻢ ﺻﻴﻔﻲ آﺧﺮ ﻳﺒﻌﺪ ﻣﺴﺎﻓﺔ 40ﻛﻢ
ﻋﻦ أﻗﺮب ﻧﻘﻄﺔ ﻋﻠﻰ اﻟﺸﺎرع ﻣﻦ اﳌﺨﻴﻢ اﻟﺼﻴﻔﻲ اﻷول .ﻳﺮاد ﻓﺘﺢ ﻣﻘﻬﻰ ﻋﻠﻰ
اﻟﺸﺎرع اﻟﺮﺋﻴﺴﻲ ﲝﻴﺚ ﻳﻜﻮن ﻋﻠﻰ ﻣﺴﺎﻓﺔ ﻣﺘﺴﺎوﻳﺔ ﻣﻦ اﳌﺨﻴﻤﲔ .ﻣﺎ اﳌﺴﺎﻓﺔ
ﺑﲔ اﳌﻘﻬﻰ وﻛﻞ ﻣﻦ اﳌﺨﻴﻤﲔ ؟
)أ( 40ﻛﻢ )ب( 31.25ﻛﻢ )ج( 25ﻛﻢ )د( 22.5ﻛﻢ
اﻟﺤﻞ :اﻹﺟﺎﺑﺔ ﻫﻲ )ب(
40 − x x C
A
30
x
B
x 2 = (30)2 + (40 − x)2
x 2 = 900 + 1600 − 80x + x 2
80x = 2500
x = 2500 = 31.25
80
) [AHSME 1954] (٦٢ﰲ اﳌﺜﻠﺚ اﻟﻘﺎﺋﻢ اﻟﺰاوﻳﺔ a : b = 1 : 2 ،△ABCﻣﺎ
ﻫﻲ اﻟﻨﺴﺒﺔ x : c − x؟