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Identify Triangles and Their Parts

In this topic, we learn to identify triangles and their parts. This topic covers the identification of triangles based on the length of sides and measure of angles.

Topic: Understand Triangles and their Parts

  • Triangles are the simplest type of polygons. All triangles have 3 sides, 3 vertices, and 3 angles

  • The sides are the lines segments that form the triangle

  • The vertex is the point where two sides meet

  • An angle is formed by two sides that meet at a vertex

  • Triangles have 3-letter names. You name a triangle by listing the letters for each vertex in order

Topic: Classify Triangles

  • Triangles are the simplest type of polygons. All triangles have 3 sides, 3 vertices, and 3 angles

  • Triangles are classified according to the length of their sides and the measure of their angles

  • A triangle with all 3 sides of different lengths is a scalene triangle; a triangle with 2 sides of the same length is an isosceles triangle

  • A triangle with all 3 sides of the same length is an equilateral triangle; a triangle with all angles less than right angles is an acute triangle

  • A triangle with one angle greater than a right angle is an obtuse triangle; a triangle with one right angle is a right triangle
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