第六章　几何图形初步 章末作业 （学生版+答案版）2025-2026学年数学七年级上册人教版

INCLUDEPICTURE "节.tif" INCLUDEPICTURE "../../../../广东慧源同步上册/广东慧源七年级上册数学/节.tif" \* MERGEFORMAT INCLUDEPICTURE "../../节.tif" \* MERGEFORMAT INCLUDEPICTURE "../../节.tif" \* MERGEFORMAT INCLUDEPICTURE "../节.tif" \* MERGEFORMAT INCLUDEPICTURE "节.tif" \* MERGEFORMAT 第六章　几何图形初步 章末作业 一、选择题 1．下列各角中是钝角的是(　B　). A．周角　　　　　 B．平角 C．周角 D．2直角 2．如图，下列说法错误的是(　A　). INCLUDEPICTURE "../../../../广东慧源同步上册/广东慧源七年级上册数学/SX228.tif" \* MERGEFORMAT INCLUDEPICTURE "../../SX228.tif" \* MERGEFORMAT INCLUDEPICTURE "../../SX228.tif" \* MERGEFORMAT INCLUDEPICTURE "../SX228.tif" \* MERGEFORMAT INCLUDEPICTURE "SX228.tif" \* MERGEFORMAT A．∠AOB也可用∠O来表示 B．∠1与∠AOB是同一个角 C．图中共有三个角：∠AOB，∠AOC，∠BOC D．∠β与∠BOC是同一个角 3．如图，OC是∠AOB的平分线，∠BOD＝∠COD，∠BOD＝15°，则∠AOC＝(　C　). INCLUDEPICTURE "../../../../广东慧源同步上册/广东慧源七年级上册数学/SX230.tif" \* MERGEFORMAT INCLUDEPICTURE "../../SX230.tif" \* MERGEFORMAT INCLUDEPICTURE "../../SX230.tif" \* MERGEFORMAT INCLUDEPICTURE "../SX230.tif" \* MERGEFORMAT INCLUDEPICTURE "SX230.tif" \* MERGEFORMAT A．60° B．45° C．30° D．15° 【解析】因为∠BOD＝∠COD，∠BOD＝15°， 所以∠COD＝3∠BOD＝45°， 所以∠BOC＝∠COD－∠BOD＝30°. 因为OC是∠AOB的平分线， 所以∠AOC＝∠BOC＝30°.故选C. 4．已知∠α是锐角，∠α与∠β互补，∠α与∠γ互余，则∠β－∠γ的度数为(　B　). A．45° B．90° C．180° D．无法确定 5．如图，直线AB与直线CD相交于点O，若OE平分∠AOC，OF平分∠BOC，∠BOF＝40°，则∠COE＝(　C　). INCLUDEPICTURE "../../../../广东慧源同步上册/广东慧源七年级上册数学/SX232.tif" \* MERGEFORMAT INCLUDEPICTURE "../../SX232.tif" \* MERGEFORMAT INCLUDEPICTURE "../../SX232.tif" \* MERGEFORMAT INCLUDEPICTURE "../SX232.tif" \* MERGEFORMAT INCLUDEPICTURE "SX232.tif" \* MERGEFORMAT A．30° B．40° C．50° D．60° 6．若一条铁路线上有10个站，则共需要制作(　B　)种火车票． A．110 B．90 C．65 D．45 7．如图，已知B，M，C依次为线段AD上的三点，M为AD的中点，MC＝CD＝AB，若BC＝8，则线段AD的长为(　D　). INCLUDEPICTURE "../../../../广东慧源同步上册/广东慧源七年级上册数学/SX233.tif" \* MERGEFORMAT INCLUDEPICTURE "../../SX233.tif" \* MERGEFORMAT INCLUDEPICTURE "../../SX233.tif" \* MERGEFORMAT INCLUDEPICTURE "../SX233.tif" \* MERGEFORMAT INCLUDEPICTURE "SX233.tif" \* MERGEFORMAT A．24 B．22 C．20 D．18 【解析】设MC＝x， 因为MC＝CD＝AB， 所以CD＝2MC＝2x，AB＝MC＝x， 所以MD＝MC＋CD＝x＋2x＝3x. 因为M为AD的中点， 所以AD＝2MD＝2×3x＝6x，AM＝MD＝3x，所以BM＝AM－AB＝3x－x＝x. 又因为BC＝8， 所以BC＝BM＋MC＝x＋x＝8， 所以x＝3， 所以AD＝6x＝6×3＝18.故选D. 8．如图，将一张长方形纸片ABCD沿对角线BD折叠后，点C落在点E处，BE交AD于点F，再将△DEF沿DF折叠后，点E落在点G处，若DG刚好平分∠ADB，则∠BDC的度数为(　D　). INCLUDEPICTURE "../../../../广东慧源同步上册/广东慧源七年级上册数学/SX234.tif" \* MERGEFORMAT INCLUDEPICTURE "../../SX234.tif" \* MERGEFORMAT INCLUDEPICTURE "../../SX234.tif" \* MERGEFORMAT INCLUDEPICTURE "../SX234.tif" \* MERGEFORMAT INCL ... ...