新人教版八年級(jí)上冊(cè)《13.2 畫軸對(duì)稱圖形》2020年同步練習(xí)卷(2)
發(fā)布:2024/4/20 14:35:0
一.填空題
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1.在平面直角坐標(biāo)系中,點(diǎn)A(a,-3)向左平移3個(gè)單位得點(diǎn)A′,若點(diǎn)A和A′關(guān)于y軸對(duì)稱,則a=.
組卷:722引用:3難度:0.5 -
2.已知點(diǎn)P(-1,2),那么點(diǎn)P關(guān)于直線x=1的對(duì)稱點(diǎn)Q的坐標(biāo)是.
組卷:1162引用:2難度:0.5 -
3.如圖,在平面直角坐標(biāo)系中,已知點(diǎn)A的坐標(biāo)為(4,4),若△ABC是關(guān)于直線y=1的軸對(duì)稱圖形,則點(diǎn)B的坐標(biāo)為;若△ABC是關(guān)于直線y=a的軸對(duì)稱圖形,則點(diǎn)B的坐標(biāo)為.
組卷:1389引用:4難度:0.5 -
4.若P關(guān)于x軸的對(duì)稱點(diǎn)為(3,a),關(guān)于y軸對(duì)稱的點(diǎn)為(b,2),則P點(diǎn)的坐標(biāo)為
組卷:484引用:5難度:0.5 -
5.已知點(diǎn)A(a,2),B(-3,b)關(guān)于y軸對(duì)稱,則ab=
組卷:379引用:5難度:0.5
二.解答題
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16.如圖,△ABC中,A點(diǎn)坐標(biāo)為(2,4),B點(diǎn)坐標(biāo)為(-3,-2),C點(diǎn)坐標(biāo)為(3,1).
(1)在圖中畫出△ABC關(guān)于x軸對(duì)稱的△A'B'C'并在下面填寫出點(diǎn)A',B',C'的坐標(biāo):
A'(
B'(
C'(
(2)求出△ABC的面積為組卷:132引用:2難度:0.5 -
17.如圖,在平面直角坐標(biāo)系中有一個(gè)△ABC,頂點(diǎn)A(-1,3),B(2,0),C(-3,-1).
(1)畫出△ABC關(guān)于y軸的對(duì)稱圖形△A1B1C1(不寫畫法);
點(diǎn)A關(guān)于x軸對(duì)稱的點(diǎn)坐標(biāo)為;
點(diǎn)B關(guān)于y軸對(duì)稱的點(diǎn)坐標(biāo)為;
點(diǎn)C關(guān)于原點(diǎn)對(duì)稱的點(diǎn)坐標(biāo)為;
(2)若網(wǎng)格上的每個(gè)小正方形的邊長(zhǎng)為1,則△ABC的面積是.組卷:564引用:7難度:0.5