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1k J  Câu 2OD4V)&" p >u r &" q ∈P∉P⊂u r *2 q ., p .  ,HPJwOV  BXJP }  *Xj  6}  Câu 3OD4Vu r   ,XDP1OXjV1OXcPwV B *  Câu 4OD4Vu p (yB&" r   ,  B *   D JJ × j w J j   D  J x − = j  j   HP DJ D DJ D + − + + j HP1 HH w − J D 1  H x − = D J j 1  D  x − = − Đa ́ p a ́ n: ~ r #U• q OJ4V 0  D J j ), r , r   h :  0  GG | u t G11.u t  0  ,) r  B,& hY q €• q #Oc4V 0 r *y ( 1y  Fy (n OHP4V   r 6 q k  1k J Fk nJ Fk k OHP4V 0DOD4V,∉ B∈ *∈6⊂ 0J  ,OXDPV1OXjV1OXcPwVFXcPwOHP4V  BOHPc4V  *OHPc4V 0j , * OHPc4VOHPc4V ByFXD1JFXHOHP4V j j   O V O V HP   HP DP DJ DJ D D − + + + = + + = D J  H  D  1 H J c D x x x − = − = = − D j J k  c   D H H H c D c   1 H  H D c j x x x − = + = − + = = = = D D  D J HP1H  J J J J − − = − = = Trường THCS KIỂM TRA 1Tiết Họ và tên : Môn :Hinh hKc 7. Tiết 16 . Tuần 8 Lớp : Ngày 09 tháng 10 năm 2010 ĐIỂM LỜI PHÊ §Ị bµi: C©u 1 (2®): §iỊn dÊu “x” vµo « trèng mµ em chän: C©u Néi dung §óng Sai 1 Hai ®êng th¼ng ph©n biƯt cïng vu«ng gãc víi mét ®êng th¼ng thø ba th× chóng song song víi nhau. 2 Hai ®êng th¼ng song song lµ hai ®êng th¼ng ph©n biƯt kh«ng c¾t nhau. 3 Hai ®êng th¼ng c¾t nhau th× vu«ng gãc. 4 NÕu hai ®êng th¼ng a, b c¾t ®êng th¼ng c mµ trong c¸c gãc t¹o thµnh cã mét cỈp gãc trong cïng phÝa b»ng nhau th× a // b. C©u 2 (3®) : a, H·y ph¸t biĨu ®Þnh lÝ ®ỵc diƠn t¶ bëi h×nh vÏ sau: c b a b, ViÕt gi¶ thiÕt, kÕt ln cđa ®Þnh lÝ ®ã b»ng kÝ hiƯu. C©u 3 (2®) : Cho ®o¹n th¼ng AB dµi 5 cm. VÏ ®êng trung trùc cđa ®o¹n th¼ng AB. C©u 4 (3®). Cho h×nh vÏ : U  45 0 30 0 O B A b a Biết a // b, A =30 0 , B =45 0 . Tính số đo ã AOB ? Đáp án và biểu điểm Câu 1 (2đ). Mỗi ý đúng cho 0,5đ. Câu 1, 2 đúng ; câu 3, 4 sai Câu 2 ( 3đ). Mỗi ý đúng cho 1,5đ a, Nếu hai đờng thẳng phân biệt cùng vuông góc với đờng thẳng thứ ba thì chúng song song với nhau. b, KL GT a // b a c, b c Câu 3 (2đ). Vẽ đúng, đủ các kí hiệu. - Vẽ đoạn thẳng AB = 5cm. - Trên AB lấy điểm M sao cho MA = MB = 2,5 cm. - Qua điểm M vẽ đờng thẳng d vuông góc với AB. - Khi đó đờng thẳng d là đờng trung trực của đoạn thẳng AB. Câu 4 (3đ). - Vẽ hình đúng đợc 0,5 điểm: - Kẻ tia Om sao cho Om // a. - Khi đó, ta có: A 1 = O 1 à à A O= = 30 0 (So le trong) O 2 = B 1 ả à D O B= = 45 0 (So le trong). A BM d Tõ ®ã tÝnh ®îc: · = 0 AOB 75 . . + = − + = = = = D D  D J HP1H  J J J J − − = − = = Trường THCS KIỂM TRA 1Tiết Họ và tên : Môn :Hinh hKc 7. Tiết 16 . Tuần 8 Lớp : Ngày 09 tháng