Scalene triangle - Definition and examples

A scalene triangle is a triangle with all three sides of different lengths.

Here are four ways to check if a triangle is scalene.

1. Close observation

Scalene triangles


After taking a  close look at the two triangles above, it is not hard to see that all three sides have different lengths.

2. The lengths of the sides are given.

A scalene triangle


3.
Using tick marks.

Sides that have the same lengths will have the same number of tick marks. The triangle below is scalene since a different number of tick marks is used for each side.

A scalene triangle with tick marks


4. The angles of the triangle are given.

If the angles of the triangle are all different, then the triangle is scalene.

For example, a triangle is scalene if the angles of the triangle are 400,  600, and 800     

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