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“triangles”
A three-sided figure that can take several shapes.
In general, a triangle has three inside angles, which add up to 180 degrees.
Triangles are divided into three basic types: obtuse, right, and acute triangles.
Triangles are named by the characteristics of their sides, which are equilateral (all sides or faces equal), isosceles (two sides of equal length), and scalene (three sides of different lengths).
This entry is located in the following unit:
Measurements and Mathematics Terms
(page 10)