A:5cm3
B:3cm3
C:38cm3
D:38.5cm3
如图:在等腰梯形ABCD中,AD∥BC,过D作DF⊥BC于F,若AD=2,BC=4,DF=2,则DC的长为( )
根据句意及汉语提示,完成句子。(1)Unfortunately, my car ____ down when I went home.(抛锚)(2)He looked at me in ____ . (惊讶)(3)____ (安全) is important.(4)Have you ____ of the romantic tale? (听说)(5)In his ____ (三十),he began to teach.
已知:如图,在平面直角坐标系xOy中,直线y= 34 x+6与x轴、y轴的交点分别为A、B两点,将∠OBA对折,使点O的对应点H落在直线AB上,折痕交x轴于点C.