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∠1<∠2

2. 2. 1. ). ). 1. ∠1=∠2. ∠1<∠2. 课堂练习. ( 3 ). ( 1 ). ( 2 ). ( 6 ). ( 5 ). ( 4 ). ( 8 ). ( 9 ). ( 7 ). ( 1 )看图按要求把序号写在括号里。. 1 、 7. 2 、 8 、 6. 是直线的有( ). 是射线的有( ). 3 、 9. 是线段的有( ). 2· 填空. 线段.

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∠1<∠2

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  1. 2 2 1 ) ) 1 ∠1=∠2 ∠1<∠2

  2. 课堂练习 (3) (1) (2) (6) (5) (4) (8) (9) (7) (1)看图按要求把序号写在括号里。 1 、7 2、8、6 是直线的有( ) 是射线的有( ) 3、9 是线段的有( )

  3. 2·填空 线段 (1)把( )的一端无限延长,就得到一条( )。 射线 直线 (2)( )上两点间的一段叫( )。 线段 直线 (3)线段和射线都是( )的一部分。

  4. 3·在括号里填入角的各部分名称。 边 ( ) ) 顶点 ( ) 边 ( )

  5. 综合练习: 1·看一看,比一比哪个角最大,哪个角最小。 (2) (3) (1) ( )最大,( )最小 (1) (3)

  6. 2·判断对错。 × (1)角越大,边越长。( ) × (2)一条直线长4厘米。( ) √ (3)线段和射线都是直线的一部分。 ( )

  7. 思考题: 数一数,下面图中共有几个角?

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