# 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