Lesson Worksheet: Triangles Mathematics

In this worksheet, we will practice recognizing, describing, and classifying triangles as acute, obtuse, or right and as isosceles, equilateral, or scalene.


Which of the following describes the given shape?

  • Aobtuse triangle
  • Bequilateral triangle
  • Cright triangle
  • Disoceles triangle
  • Eacute triangle


What type of triangle is this?

  • ARight triangle
  • BIsoceles triangle
  • CObtuse triangle
  • DEquilateral triangle
  • EScalene triangle


What type of triangle is this?

  • AAn acute triangle
  • BAn isosceles triangle
  • CA right triangle
  • DAn obtuse triangle
  • EAn equilateral triangle


What do these shapes have in common?

  • ABoth are obtuse triangles.
  • BBoth are isosceles triangles.
  • CBoth are right triangles.
  • DBoth are equilateral triangles.
  • EBoth are acute triangles.


Which of the following describes the given shape?

  • Aright triangle
  • Bobtuse triangle
  • Cisoceles triangle
  • Dequilateral triangle
  • Escalene triangle


Consider the following triangle.

Which of these types of triangles is it?

  • AAn acute scalene triangle
  • BA right isosceles triangle
  • CAn obtuse isosceles triangle
  • DAn acute isosceles triangle
  • EAn obtuse scalene triangle


True or False: Some right triangles are isosceles.

  • ATrue
  • BFalse


Ghena and Nouf were each asked to draw a right isosceles triangle with at least one side that is 15 cm long. The triangles they drew are shown below.

Who drew her triangle correctly?

  • AOnly Ghena
  • BOnly Nouf
  • CBoth Ghena and Nouf
  • DNeither Ghena nor Nouf


Hoor drew the triangle shown below.

Which of these types of triangles did she draw?

  • AAn acute isosceles triangle
  • BAn acute scalene triangle
  • CAn obtuse scalene triangle
  • DA right scalene triangle
  • EAn obtuse isosceles triangle


True or False: Some obtuse triangles are isosceles.

  • AFalse
  • BTrue

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