人教五四新版九年級(jí)(上)中考題同步試卷:30.2 中心對(duì)稱(06)
發(fā)布:2024/4/20 14:35:0
一、選擇題(共17小題)
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1.如圖,在方格紙上建立的平面直角坐標(biāo)系中,將OA繞原點(diǎn)O按順時(shí)針?lè)较蛐D(zhuǎn)180°得到OA′,則點(diǎn)A′的坐標(biāo)為( ?。?/h2>
A.(3,1) B.(3,-1) C.(1,-3) D.(1,3) 組卷:262引用:60難度:0.9 -
2.如圖,在平面直角坐標(biāo)系中,點(diǎn)B、C、E、在y軸上,Rt△ABC經(jīng)過(guò)變換得到Rt△ODE.若點(diǎn)C的坐標(biāo)為(0,1),AC=2,則這種變換可以是( )
A.△ABC繞點(diǎn)C順時(shí)針旋轉(zhuǎn)90°,再向下平移3 B.△ABC繞點(diǎn)C順時(shí)針旋轉(zhuǎn)90°,再向下平移1 C.△ABC繞點(diǎn)C逆時(shí)針旋轉(zhuǎn)90°,再向下平移1 D.△ABC繞點(diǎn)C逆時(shí)針旋轉(zhuǎn)90°,再向下平移3 組卷:2991引用:92難度:0.9 -
3.在平面直角坐標(biāo)系中,把點(diǎn)P(-3,2)繞原點(diǎn)O順時(shí)針旋轉(zhuǎn)180°,所得到的對(duì)應(yīng)點(diǎn)P′的坐標(biāo)為( ?。?/h2>
A.(3,2) B.(2,-3) C.(-3,-2) D.(3,-2) 組卷:2337引用:82難度:0.9 -
4.在下面的網(wǎng)格圖中,每個(gè)小正方形的邊長(zhǎng)均為1,△ABC的三個(gè)頂點(diǎn)都是網(wǎng)格線的交點(diǎn),已知B,C兩點(diǎn)的坐標(biāo)分別為(-1,-1),(1,-2),將△ABC繞點(diǎn)C順時(shí)針旋轉(zhuǎn)90°,則點(diǎn)A的對(duì)應(yīng)點(diǎn)的坐標(biāo)為( ?。?/h2>
A.(4,1) B.(4,-1) C.(5,1) D.(5,-1) 組卷:1602引用:69難度:0.9 -
5.如圖,將斜邊長(zhǎng)為4的直角三角板放在直角坐標(biāo)系xOy中,兩條直角邊分別與坐標(biāo)軸重合,P為斜邊的中點(diǎn).現(xiàn)將此三角板繞點(diǎn)O順時(shí)針旋轉(zhuǎn)120°后點(diǎn)P的對(duì)應(yīng)點(diǎn)的坐標(biāo)是( ?。?/h2>
A.( ,1)3B.(1,- )3C.(2 ,-2)3D.(2,-2 )3組卷:2604引用:78難度:0.9 -
6.如圖,在平面直角坐標(biāo)系xOy中,△A′B′C′由△ABC繞點(diǎn)P旋轉(zhuǎn)得到,則點(diǎn)P的坐標(biāo)為( ?。?/h2>
A.(0,1) B.(1,-1) C.(0,-1) D.(1,0) 組卷:2693引用:73難度:0.9 -
7.如圖,在平面直角坐標(biāo)系xOy中,直線y=
x經(jīng)過(guò)點(diǎn)A,作AB⊥x軸于點(diǎn)B,將△ABO繞點(diǎn)B逆時(shí)針旋轉(zhuǎn)60°得到△CBD.若點(diǎn)B的坐標(biāo)為(2,0),則點(diǎn)C的坐標(biāo)為( )3A.(-1, )3B.(-2, )3C.(- ,1)3D.(- ,2)3組卷:4922引用:88難度:0.9 -
8.如圖,點(diǎn)A,點(diǎn)B的坐標(biāo)分別是(0,1),(a,b),將線段AB繞A旋轉(zhuǎn)180°后得到線段AC,則點(diǎn)C的坐標(biāo)為( ?。?/h2>
A.(-a,-b+1) B.(-a,-b-1) C.(-a,-b+2) D.(-a,-b-2) 組卷:656引用:64難度:0.9 -
9.如圖,正方形OABC的兩邊OA、OC分別在x軸、y軸上,點(diǎn)D(5,3)在邊AB上,以C為中心,把△CDB旋轉(zhuǎn)90°,則旋轉(zhuǎn)后點(diǎn)D的對(duì)應(yīng)點(diǎn)D′的坐標(biāo)是( ?。?/h2>
A.(2,10) B.(-2,0) C.(2,10)或(-2,0) D.(10,2)或(-2,0) 組卷:5085引用:134難度:0.7 -
10.如圖所示,邊長(zhǎng)為2的正三角形ABO的邊OB在x軸上,將△ABO繞原點(diǎn)O逆時(shí)針旋轉(zhuǎn)30°得到三角形OA1B1,則點(diǎn)A1的坐標(biāo)為( ?。?/h2>
A.( ,1)3B.( ,-1)3C.(1,- )3D.(2,-1) 組卷:1669引用:80難度:0.7
二、填空題(共13小題)
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29.在平面直角坐標(biāo)系中,將點(diǎn)A(4,2)繞原點(diǎn)逆時(shí)針?lè)较蛐D(zhuǎn)90°后,其對(duì)應(yīng)點(diǎn)A′的坐標(biāo)為
組卷:452引用:66難度:0.7 -
30.如圖,在平面直角坐標(biāo)系xOy中,已知點(diǎn)A(3,4),將OA繞坐標(biāo)原點(diǎn)O逆時(shí)針旋轉(zhuǎn)90°至OA′,則點(diǎn)A′的坐標(biāo)是.
組卷:2255引用:104難度:0.7