Worksheet: Types of Triangles: Sides

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:

If 𝐴𝐵=13cm, 𝐵𝐶=6cm, and 𝐶𝐴=9cm, what is the type of 𝐴𝐵𝐶 in terms of its side lengths?

  • Ascalene triangle
  • Bisosceles triangle
  • Cequilateral triangle

Q3:

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

  • Aisosceles triangle
  • Bscalene triangle
  • Cequilateral triangle

Q4:

Suppose that in 𝐴𝐵𝐶, we have 𝐴𝐵=8.5, 𝐵𝐶=8.5, and 𝐴𝐶=11. What kind of triangle is this, in terms of its side lengths?

  • Aan isosceles triangle
  • Ban equilateral triangle
  • Ca scalene triangle

Q5:

If 𝐴𝐵=5cm, 𝐵𝐶=8cm, and 𝐶𝐴=11cm, what is the type of 𝐴𝐵𝐶 in terms of its side lengths?

  • Ascalene triangle
  • Bisosceles triangle
  • Cequilateral triangle

Q6:

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

  • Aisosceles triangle
  • Bscalene triangle
  • Cequilateral triangle

Q7:

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

Q8:

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

Q9:

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

Q10:

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

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

Q11:

Is an equilateral triangle an isosceles triangle?

  • Ayes
  • Bno

Q12:

Could an isosceles triangle also be an equilateral triangle?

  • Ano
  • Byes

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