Triangles are a different type depending on how many sides are the same length (which is also how many angles are equal).
Triangles are equilateral, isosceles or scalene depending on whether 3, 2 or 0 side lengths and angles are equal.
Here is an interactive game to help you learn about the types of triangle.
Click on a triangle so it drops into the correct "bucket."
In total, there are 10 triangles to clear.
If a triangle drops into the wrong "bucket," you will lose one of your three lives.
Type of Triangle by Angles
Triangles are a different type depending on the size of the angles inside the triangle.
Triangles are acute, obtuse or right triangles depending on whether all angles are acute (less than 90°), one angle is obtuse (more than 90°) or one angle is a right angle (90°).
Acute triangles have all acute angles (less than 90°).
3 angles are less than 90°.
Obtuse triangles have one angle that is obtuse (more than 90°, less than 180°).
1 angle is more than 90°.
2 angles are less than 90°.
Triangles can be classified by both lengths of sides and by angles. This means a triangle can be both acute and isosceles, or obtuse and scalene.
The slider below shows more real examples of the types of triangles.
Open the slider in a new tab