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直线l1∥l2，一块含45°角的直角三角板如图放置．若∠1＝75°，则∠2＝ 度．
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如图直线a∥b一块含60°角的直角三角板ABC∠
=60°）按如图所示放置.若∠1=55°，则∠2的度数为（ ）
A.105°
110°
115°
120°
直线l1∥l2一块含45°角的直角三角板如图放置∠1=85°则∠2=.
将一副直角三角板如图1放置使含30°角的三角板的直角边和含45°角的三角板一条直角边在同一条直线上则
75°
65°
45°
30°
直线l1∥l2一块含45°角的直角三角板如图放置∠1=85°则∠2=.
已知直线l1∥l2一块含30°角的直角三角板如图所示放置∠1＝25°则∠2等于
30°
35°
40°
45°
直线l1∥l2一块含45°角的直角三角板如图所示放置∠1＝85°则∠2＝.
已知直线l1∥l2一块含30°角的直角三角板如图所示放置∠1＝25°则∠2等于
30°
35°
40°
45°
已知直线l1∥l2一块含30°角的直角三角板如图所示放置∠1=25°则∠2等于
30°
35°
40°
45°
已知直线l1∥l2一块含30°角的直角三角板如图所示放置∠1＝25°求∠2的度数.
已知直线m∥n将一块含30°角的直角三角板ABC按如图方式放置∠ABC=30°其中
，
两点分别落在直线m，n上，若∠1=20°，则∠2的度数为（ ）
A.20°B.30°
45°
50°
如图直线a∥b一块含60°角的直角三角板ABC∠A.=60°按如图所示放置.若∠1=45°则∠2的度
已知直线l1∥l2一块含30°角的直角三角板如图所示放置∠1＝25°则∠2＝_______.
直线l1∥l2一块含45°角的直角三角板如图所示放置∠1＝85°则∠2＝.
将一副直角三角板如图1放置使含30°角的三角板的直角边和含45°角的三角板一条直角边在同一条直线上则
75°
65°
45°
30°
已知:直线l1∥l2一块含30°角的直角三角板如图所示放置∠1=25°则∠2等于.第4题
30°
35°
40°
45°
直线l1∥l2一块含45°角的直角三角板如图放置∠1=85°则∠2=.
直线l1∥l2一块含45°角的直角三角板如图放置∠1=85°则∠2=.
如图在平行线l1l2之间放置一块直角三角板三角板的锐角顶点
，
分别在直线l
1
、l
2
上，若∠l=65°，则∠2的度数是（ ）
A.25°B.35°
45°
65°
已知直线l1∥l2一块含30°角的直角三角板如图所示放置∠1＝25°则∠2等于
30°
35°
40°
45°
直线l1∥l2一块含45°角的直角三角板如图放置∠1=85°则∠2=.
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A.105° 110° 115° 120°
A.20°B.30° 45° 50°
A.25°B.35° 45° 65°
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