外角和

1

让学生体会多边形的外角和在实际生活中有广泛的应用。

To enable students to understand the wide range of applications of the sum of exterior angles of polygons in real life .
2

两个发球区的发球直得率在外角和内角上差异较小，追身球有显著性差异。

Difference is less on being so straight as two half court service to be led in the exterior angle and the interior angle , body-hit has notable difference .
3

·发球上网的线路选择上，内角、外角和近身之间的比例为9：9：1，内外角之间没有差异。

· In the options of the route of serve and volley , the ratio of inside , outside and close is 9:9:1 , no difference between the inside and outside corner . 5 .
4

文章具体介绍了现浇混凝土楼板外角裂缝的成因和预防措施。

Analysis on the corner cracks on cast-in-place concrete floor and repairing measures ;