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asinus

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 #3
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 PQ = 8, QR = 5, and PR = 10.

 

fPR(x)=052=82+1022810cos P160cos  P=64+10025cos P=64+10025160P=29.686°

 

fPX(x)=tan (29.6862)xfPX(x)=0.265xsin R:sin P=8:5sin  R=8sin P5=8sin 29.686°5R=52.4105°fRQ(x)=tan (R)(x10)fRQ(x)=tan (52,4105°)(x10)fRQ(x)=1,3(x10)

 

fPX(x)=fPQ(x)0.265x=1.3(x10)0.265x=1.3x+13x=131.565xX=8.3067yX=2.2013

 

fXY(x)=m(xxX)+yXm=tan (90°R)=tan (90°52.4105°)m=0.7698fXY(x)=0.7698(x8.3067)+2.2013fXY(x)=0.7698x6.3946+2.2013=0xY=5.4472yY=0

 

LXY=y2X+(xXxY)2=2.20132+(8.30675.4472)2LXY=3.6087

 

The length of ¯XY is 3.6807.

 

laugh !

16 avr. 2024