三角形英语怎么说

三角形在英语中叫做"triangle"。"triangle"来源于拉丁语"triangulum"，意思是"三角形"。例句如下：
This shape is a triangle.
A triangle has three sides and three angles.
The sides of a triangle can be equal in length or different lengths.
Isosceles and equilateral triangles are types of triangles where some or all of the sides have equal lengths.
The sum of the angles in a triangle is always 180 degrees.
Scalene triangles have no sides of equal length.
Acute triangles have all three angles measuring less than 90 degrees.
Obtuse triangles have one angle that measures more than 90 degrees.
Right triangles have one angle that measures exactly 90 degrees.