2.
如图,AB是⊙O的直径,D是⊙O上一点,AT平分∠BAD交⊙O于点T,过T作AD的垂线交AD的延长线于点C
(1)求证:CT为⊙O的切线;
(2)若AD=2,TC=$\sqrt{3}$,求⊙O的半径.
(1)求证:CT为⊙O的切线;
(2)若AD=2,TC=$\sqrt{3}$,求⊙O的半径.
18.在-2、-$\sqrt{2}$、0、1这四个数中,最大的数是( )
0 282638 282646 282652 282656 282662 282664 282668 282674 282676 282682 282688 282692 282694 282698 282704 282706 282712 282716 282718 282722 282724 282728 282730 282732 282733 282734 282736 282737 282738 282740 282742 282746 282748 282752 282754 282758 282764 282766 282772 282776 282778 282782 282788 282794 282796 282802 282806 282808 282814 282818 282824 282832 366461
| A. | -2 | B. | -$\sqrt{2}$ | C. | 0 | D. | 1 |