It is the 2 sides which are opposite the 2 equal base angles which are equal in length. Make sure that you get the equal sides and angles in the correct position. The common mistake is identifying the wrong sides as the equal (congruent sides). Seeing the triangles in different positions will help with this understanding.įor example, here is a picture where the base angles of an isosceles triangle are on the top. The common mistake is thinking that the base of the angles are always on the bottom of the isosceles triangle. So when students classify the triangles, they wind up classifying them incorrectly. What Type of Angle Triangles can also have names that tell you what type of angle is inside: Combining the Names. However, equilateral triangles have three equal (congruent) sides and angles and can be classified as isosceles.Ī common mistake when classifying triangles is mixing up the definitions of acute angle and obtuse angle. Isosceles triangles only have two equal (congruent) sides and angles and cannot be classified as equilateral. Understanding that properties of isosceles triangles and equilateral triangles can help with questions like this. The easy mistake to make is stating that isosceles triangles can be classified as equilateral triangles.
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