题目内容
已知△ABC的顶点坐标是A(-1,5),B(-5,5),C(-6,2)
(1)分别写出点A,B,C关于原点O的对称点A′、B′、C′的坐标:A′______B′______C′______
(2)在坐标平面内画出△A′B′C′;
(3)△A′B′C′的面积的值等于______.
(1)分别写出点A,B,C关于原点O的对称点A′、B′、C′的坐标:A′______B′______C′______
(2)在坐标平面内画出△A′B′C′;
(3)△A′B′C′的面积的值等于______.
(1)A′(1,-5),B′(5,-5),C′(6,-2);
(2)△A′B′C′如图所示;
(3)△A′B′C′的面积=
×4×3=6.
故答案为:(1)(1,-5),(5,-5),(6,-2);(3)6.
(2)△A′B′C′如图所示;
(3)△A′B′C′的面积=
1 |
2 |
故答案为:(1)(1,-5),(5,-5),(6,-2);(3)6.
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