A:had been ruined
B:had ruined
C:has been ruined
D:ruined
如图,在△ABC中,AB=AC=5,BC=6,点D为BC边上一动点(不与点B重合),以D为圆心,DC的长为半径作⊙D. 当⊙D与AB边相切时,BD的长为____
我会填。
3×____ = 21 6×____ =4 2
49÷____ = 7 42÷____ = 7
3∶5=12∶____= ()15 ____=____÷10