幾何的函數(shù)表達(dá)式題
在直角梯形ABCD中,∠A=∠D=90度,截取AE=BF=DG=X,已知AB=6,CD=3,AD=4,求四邊形CGEF的面積S關(guān)于X的函數(shù)表達(dá)式和X的取值范圍.
圖:EF有條線(xiàn)連著,因?yàn)閷?shí)在找不到什么橫線(xiàn)表示..
D x G C
┌———————————┐
│ / \ \
│ / \ \
│ / \ \
E│ / \ \
│ \ \
┗——————————————┚—┚
A F B
`D``x`` G ``````````````C
`┌——————┐
`│```/ `````````````````\ \
`│``/``````````````````` \ \
`│`/````````````````````` \ \
E│/``````````````````````` \ \
`│ `````````````````````````\` \
`┗—————————┚—┚
A`````````````````````````````F```B