Lesson Worksheet: Types of Triangles: Sides Mathematics • 3rd Grade

In this worksheet, we will practice classifying triangles as equilateral, isosceles, or scalene by considering the lengths of their sides.

Q1:

What kind of triangles have all sides of the same length?

  • Ascalene triangles
  • Bequilateral triangles
  • Cisosceles triangles
  • Dright triangles

Q2:

What type of triangle is 𝐴𝐵𝐶, in terms of its side lengths?

  • Aisosceles triangle
  • Bscalene triangle
  • Cequilateral triangle

Q3:

Are the number of lines of symmetry of a scalene triangle less than, equal to or greater than the number of lines of symmetry of an isosceles triangle?

  • AGreater than
  • BEqual to
  • CLess than

Q4:

Are the number of lines of symmetry of an isosceles triangles less than, equal to or greater than the number of lines of symmetry of an equilateral triangle?

  • AEqual to
  • BLess than
  • CGreater than

Q5:

James drew an equilateral triangle with two sides whose sum equals 16 inches. Determine the length of the third side.

Q6:

Complete the following: An equilateral triangle is a triangle whose sides are .

  • Aintersecting at one point
  • Bequal in length
  • Cnot equal in length
  • Dparallel

Q7:

Is an equilateral triangle an isosceles triangle?

  • AYes
  • BNo

Q8:

Are all isosceles triangles also equilateral triangles?

  • ANo
  • BYes

Q9:

Is this an equilateral, an isosceles, or a scalene triangle?

  • AA scalene triangle
  • BAn equilateral triangle
  • CAn isosceles triangle

Q10:

Which of these is an isosceles triangle?

  • ATriangle A
  • BTriangle B

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