A triangle is a geometrical shape that is formed by three straight lines or line segments that connect three non-collinear points in a plane. These three points are called **vertices **of the triangle, and the line segments connecting them are called **sides**. The triangle is a closed figure, and the region enclosed by the sides is called the **interior of the triangle**.

**A triangle can be classified according to the length of its sides and the measurement of its angles.** For example, if all three sides of a triangle have equal length, it is called an **equilateral **triangle. If two sides of a triangle have equal length, it is called an **isosceles **triangle. If none of the sides have the same length, it is called a **scalene **triangle.

Similarly,** triangles can be classified by the measurement of their angles.** For example, if all three angles of a triangle are acute (less than 90 degrees), it is called an **acute **triangle. If one angle of a triangle is a right angle (90 degrees), it is called a **right triangle**. If one angle of a triangle is obtuse (greater than 90 degrees), it is called an **obtuse **triangle.

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