1/5单选题
难度：
1.如图，已知以直角梯形ABCD的腰CD为直径的半圆O与梯形上底AD、下底BC以及腰AB均相切，切点分别是D，C，E. 若半圆O的半径为2，梯形的腰AB为5，则该梯形的周长是（ ）
| A | 9 |
| B | 10 |
| C | 12 |
| D | 14 |
- 提示1：
- IOeUseWIh+e6v+mVv+WumueQhuWPr+efpe+8mkFEPUFF77yMQkM9QkXvvIzlm6DmraTmoq/lvaLnmoTlkajplb89MkFCK0NE77yM5bey55+l5LqGQULlkoziiplP55qE5Y2K5b6E77yM55Sx5q2k5Y+v5rGC5Ye65qKv5b2i55qE5ZGo6ZW/Lg==
正确答案：RA==
6Kej77ya5qC55o2u5YiH57q/6ZW/5a6a55CG77yM5b6XQUQ9QUXvvIxCQz1CRe+8jOaJgOS7peair+W9oueahOWRqOmVv+aYrzXDlzIrND0xNC4gPGJyPuaVhemAiUQuIA==
2/5单选题
难度：
2.如图，PA、PB分别是⊙O的切线，A、B为切点，AC是⊙O的直径，已知∠BAC=35°，∠P的度数为（ ）
| A | 35° |
| B | 45° |
| C | 60° |
| D | 70° |
- 提示1：
- IOagueaNruWIh+e6v+mVv+WumueQhuW+l+etieiFsOKWs1BBQu+8jOi/kOeUqOWGheinkuWSjOWumueQhuaxguinoy4=
正确答案：RA==
6Kej77ya5qC55o2u5YiH57q/55qE5oCn6LSo5a6a55CG5b6X4oigUEFDPTkwwrDvvIw8YnI+4oi04oigUEFCPTkwwrAt4oigQkFDPTkwwrAtMzXCsD01NcKwLiA8YnI+5qC55o2u5YiH57q/6ZW/5a6a55CG5b6XUEE9UELvvIw8YnI+5omA5Lul4oigUEJBPeKIoFBBQj01NcKw77yMPGJyPuaJgOS7peKIoFA9NzDCsC4gPGJyPuaVhemAiUQuIA==
3/5单选题
难度：
3.如图，一圆内切四边形ABCD，且AB=16，CD=10，则四边形的周长为（ ）
| A | 50 |
| B | 52 |
| C | 54 |
| D | 56 |
- 提示1：
- IOagueaNruWIh+e6v+mVv+WumueQhu+8jOWPr+S7peivgeaYjuWchuWkluWIh+Wbm+i+ueW9oueahOaAp+i0qO+8muWchuWkluWIh+Wbm+i+ueW9oueahOS4pOe7hOWvuei+ueWSjOebuOetie+8jOS7juiAjOWPr+axguW+l+Wbm+i+ueW9oueahOWRqOmVvy4=
正确答案：Qg==
6Kej77ya55Sx6aKY5oSP5Y+v5b6X5ZyG5aSW5YiH5Zub6L655b2i55qE5Lik57uE5a+56L655ZKM55u4562J77yMPGJyPuaJgOS7peWbm+i+ueW9oueahOWRqOmVvz0y77yIMTYrMTDvvIk9NTIuIDxicj7mlYXpgIlCLiA=
4/5单选题
难度：
4.如图，PA、PB、DE分别切⊙O于A、B、C点，若圆O的半径为6，OP=10，则△PDE的周长为（ ）
| A | 10 |
| B | 12 |
| C | 16 |
| D | 20 |
- 提示1：
- IOagueaNruWIh+e6v+eahOaAp+i0qO+8jOW+l+WIsOebtOinkuS4ieinkuW9ok9BUO+8jOagueaNruWLvuiCoeWumueQhuaxguW+l1BB55qE6ZW/77yb5qC55o2u5YiH57q/6ZW/5a6a55CG77yM5b6XQUQ9Q0TvvIxDRT1CRe+8jFBBPVBC77yM5LuO6ICM5rGC6KejLg==
正确答案：Qw==
6Kej77ya4oi1UEHjgIFQQuOAgURF5YiG5Yir5YiH4oqZT+S6jkHjgIFC44CBQ+eCue+8jDxicj7iiLRBRD1DRO+8jENFPUJF77yMUEE9UELvvIxPQeKKpUFQLiA8YnI+5Zyo55u06KeS5LiJ6KeS5b2iT0FQ5Lit77yM5qC55o2u5Yu+6IKh5a6a55CG77yM5b6XQVA9OO+8jDxicj7iiLTilrNQREXnmoTlkajplb/kuLoyQVA9MTYuIDxicj7mlYXpgIlDLiA=
5/5单选题
难度：
5.已知：如图，以定线段AB为直径作半圆O，P为半圆上任意一点（异于A、B），过点P作半圆O的切线分别交过A、B两点的切线于D、C，连接OC、BP，过点O作OM∥CD分别交BC与BP于点M、N. 下列结论：① S四边形ABCD=
AB•CD；② AD=AB；③ AD=ON；④ AB为过O、C、D三点的圆的切线. 其中正确的个数有（ ）
AB•CD；② AD=AB；③ AD=ON；④ AB为过O、C、D三点的圆的切线. 其中正确的个数有（ ） | A | 1个 |
| B | 2个 |
| C | 3个 |
| D | 4个 |
- 提示1：
- IOi/nuaOpU9E44CBQVDvvIzmoLnmja7liIfnur/plb/lrprnkIbmsYLlh7pBRD1EUO+8jENQPUJD77yM5qC55o2u6Z2i56ev5YWs5byP5Yik5pat4pGg5Y2z5Y+v77yb5qC55o2u55u06KeS5LiJ6KeS5b2i5pac6L655aSn5LqO55u06KeS6L655Y2z5Y+v5Yik5pat4pGh77yb6K+B4pazRFBP5ZKM4pazUE9O5YWo562J6K+B5Ye6RFA9T07ljbPlj6/liKTmlq3ikaLvvIzor4HilrNET0PmmK/nm7Top5LkuInop5LlvaLvvIzlj5ZDROS4reeCuVHvvIzor4Hlh7pPUeaYr+WNiuW+hO+8jOivgeair+W9okFCQ0TvvIzmjqjlh7riiKBBT1E9OTDCsOWNs+WPr+WIpOaWreKRoy4=
正确答案：Qw==
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