中学生学习报数学初一下泸科版

1.若角1+角2=90°，且角1=35°43'26'',则角2=( )°
2.从一个多边形的某个顶点出发,分别连接这个点和其余各项点,可以把这个多边形分割成十个三角形,则这个多边形的变数为( )
3.延长线段AB到C,使BC=1/3AB,D为AC中点,且DC=6cm,则AB长是( )
1.54°16'34''
2.12
3.9cm

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