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MEAP Preparation - Grade 7 Mathematics
4.16 Classifying Triangles by Sides

Classification based on sides

Triangles can be divided into three kinds according to the measures of their sides.
  1. Equilateral triangle:
    • A triangle whose sides are equal is called an equilateral triangle.
    • All the angles of an equilateral triangle are equal.
  2. Isosceles triangle:
    • A triangle in which two sides are equal is called an isosceles triangle.
    • In an isosceles triangle the unequal side is called the base of the triangle.
    • The base angles of an isosceles triangle are congruent.
  3. Scalene triangle:
    • If no two sides of a triangle are equal, it is called a scalene triangle.

Directions: Read the above properties of triangles and answer the following questions:
  1. Illustrate each of the above properties by drawing a triangle.
  2. Write in your own words, the different classification of triangles based on sides.

Q 1: "The base angles of an isosceles triangle are congruent".

Q 2: "In an equilateral triangle all the sides are _________".

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Question 4: This question is available to subscribers only!

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