Classifying Triangles

Triangles can be classified using their ...............

• vertices

• Sides & angles

• Angles

• Sides

A triangle with 3 equal sides is called ..................

• right-angled triangle

• isosceles triangle

• equilateral triangle

A triangle with at least one angle greater than 90 degrees is a/an ________ triangle.

• right-angled

• acute-angled

• obtuse-angled

How many acute angles does an acute-angled triangle has?

• 1

• 2

• 3

Name this triangle.

• Equilateral triangle

• Isosceles triangle

• Right-angled triangle

Name this triangle.

• Isosceles triangle

• Equilateral triangle

• Scalene triangle

How is this triangle classified?

• Right-Isosceles triangle

• Acute triangle

• Obstuse-Scalene triangle

Danielle has drawn a triangle with sides of length 5cm, 5cm and 8cm.

What type of triangle has she drawn?

• Isosceles triangle

• Equilateral triangle

Acute triangles are triangles with only acute angles inside.

Select all the acute triangles below:

• 
• 
• 
• 

The following options show the different sides of triangles. Which option is a Isosceles?

• 5 cm, 4 cm, 5 cm

• 3 cm, 4 cm, 8 cm

• 5 cm, 5 cm, 5 cm