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.

Q1:

Which of the following describes the given shape?

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

Q2:

What type of triangle is this?

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

Q3:

What type of triangle is this?

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

Q4:

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.

Q5:

Which of the following describes the given shape?

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

Q6:

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

Q7:

True or False: Some right triangles are isosceles.

  • ATrue
  • BFalse

Q8:

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

Q9:

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

Q10:

True or False: Some obtuse triangles are isosceles.

  • AFalse
  • BTrue

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