Line up in five rows
The first line:1111
Second line:111111.
The third line:111111.
Line 4:1111111.
Row 5:1111111.
The person in front is the leader and can stand in one third of the stage.
Boys stand behind, and the middle of the taller station lines up to both sides in turn!
Try to stand in a conspicuous position when reciting!
Reading poetry and standing in a triangle,
A closed figure composed of three line segments that are not on the same straight line is called a triangle (PEP textbook). Common triangles are divided into isosceles triangles (isosceles triangles with unequal waist and bottom and isosceles triangles with equal waist and bottom) and isosceles triangles; According to the angle, there are right triangle, acute triangle and obtuse triangle, among which acute triangle and obtuse triangle are collectively called oblique triangle.