Scalene, isosceles, and equilateral triangles

Learning Objectives Identify a triangle as a shape with three straight sides. Define equilateral, isosceles, and scalene triangles based on their side lengths. Classify a triangle when given its side lengths. Sort pictures of triangles into three groups: equilateral, isosceles, and scalene. Use a ruler to measure the sides of a triangle and determine its type. Draw an example of each type of triangle. Have you ever noticed that a slice of pizza, a Dorito chip, and a yield sign are all triangles, but they look different? 🍕 Let's find out why! Today, we are going to learn the special names for triangles. We will learn how to classify them into three groups based on the lengths of their sides. This helps us describe shapes much better, just like a scientist! Real-World...

TermDefinitionExample TriangleA flat shape with 3 straight sides and 3 corners (or vertices).A slice of pizza is a triangle. SideOne of the straight lines that makes up the outside of a shape.A triangle has 3 sides. Equal SidesSides that are the exact same length. You can measure them with a ruler to check.If one side is 5 inches long and another side is 5 inches long, they are equal sides. Equilateral TriangleA triangle where all three sides are equal in length.A triangle with sides measuring 4 cm, 4 cm, and 4 cm. Isosceles TriangleA triangle where exactly two sides are equal in length.A triangle with sides measuring 6 inches, 6 inches, and 4 inches. Scalene TriangleA triangle where none of the sides are equal in length. All three sides are different lengths.A triangle with sides measuri...

Equilateral Triangle Rule Side 1 = Side 2 = Side 3 Use this rule when you measure a triangle and find that all three sides are the exact same length. Isosceles Triangle Rule Two sides are equal Use this rule when you find that exactly two of the triangle's sides are the same length, and the third one is different. Scalene Triangle Rule Side 1 ≠ Side 2 ≠ Side 3 Use this rule when you measure a triangle and find that all three sides have different lengths.