Comparing & classifying isosceles and scalene triangles

In this lesson, we will compare different triangles and introduce isosceles and scalene triangles.

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Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which properties do all triangles have?

4 sides and 4 vertices3 sides and 2 vertices2 sides and 3 vertices3 sides and 3 vertices

1/6

Q2.What is the name given to a regular triangle?

Equilateral triangleRight angled triangleTrapeziumRegularity

2/6

Q3.Which of the statements best describe an equilateral triangle?

3 sides with different measurements1 angle equal to 90 degrees2 angles equal to 180 degrees3 angles, where each angle is equal to 60 degrees

3/6

Q4.Which statement best describes a right angled triangle

1 angle that measures to 90 degrees3 angles that measure exactly the sameA triangle with three 60 degree anglesA triangle with a width of 10cm

4/6

Q5.It is possible to create a large equilateral triangle from either...

3 or 5 smaller equilateral triangles2 or 4 smaller equilateral triangles4 or 9 smaller equilateral triangles6 or 9 smaller equilateral triangles

5/6

Q6.If a triangle has the angles: 60 degrees and 30 degrees, what is the 3rd angle?

60 degrees90 degrees30 degrees180 degrees

6/6

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >

Quiz:

Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which properties do all triangles have?

4 sides and 4 vertices3 sides and 2 vertices2 sides and 3 vertices3 sides and 3 vertices

1/6

Q2.What is the name given to a regular triangle?

Equilateral triangleRight angled triangleTrapeziumRegularity

2/6

Q3.Which of the statements best describe an equilateral triangle?

3 sides with different measurements1 angle equal to 90 degrees2 angles equal to 180 degrees3 angles, where each angle is equal to 60 degrees

3/6

Q4.Which statement best describes a right angled triangle

1 angle that measures to 90 degrees3 angles that measure exactly the sameA triangle with three 60 degree anglesA triangle with a width of 10cm

4/6

Q5.It is possible to create a large equilateral triangle from either...

3 or 5 smaller equilateral triangles2 or 4 smaller equilateral triangles4 or 9 smaller equilateral triangles6 or 9 smaller equilateral triangles

5/6

Q6.If a triangle has the angles: 60 degrees and 30 degrees, what is the 3rd angle?

60 degrees90 degrees30 degrees180 degrees

6/6

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Worksheet

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This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >

Quiz:

Comparing and classifying isosceles and scalene triangles

Questions that test your knowledge on 2 types of triangles (isosceles & scalene triangles)

Q1.What is the name given to a triangle with 3 equal sides?

Right angled triangleTrapeziumScalene triangleEquilateral triangle

1/5

Q2.What is the name given to a triangle which has the following three angles: 80°, 40° and 60° ?

Equilateral triangleRight angled triangleScalene triangleIsosceles triangle

2/5

Q3.If a triangle has the angles of 90° and 60°, what is the third angle?

30°90°180°40°

3/5

Q4.Which of these are NOT interior angles of a triangle?

Select two (2) boxes

70° , 70° and 40°60°, 60° and 60°80°, 20° and 70°40°, 55° and 75°

4/5

Q5.A right angled triangle can also be ...

an equilateral trianglea scalene or isosceles trianglea scalene or an equilateral trianglean isosceles or an equilateral triangle

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >

Quiz:

Comparing and classifying isosceles and scalene triangles

Questions that test your knowledge on 2 types of triangles (isosceles & scalene triangles)

Q1.What is the name given to a triangle with 3 equal sides?

Right angled triangleTrapeziumScalene triangleEquilateral triangle

1/5

Q2.What is the name given to a triangle which has the following three angles: 80°, 40° and 60° ?

Equilateral triangleRight angled triangleScalene triangleIsosceles triangle

2/5

Q3.If a triangle has the angles of 90° and 60°, what is the third angle?

30°90°180°40°

3/5

Q4.Which of these are NOT interior angles of a triangle?

Select two (2) boxes

70° , 70° and 40°60°, 60° and 60°80°, 20° and 70°40°, 55° and 75°

4/5

Q5.A right angled triangle can also be ...

an equilateral trianglea scalene or isosceles trianglea scalene or an equilateral trianglean isosceles or an equilateral triangle

5/5

Lesson summary: Comparing & classifying isosceles and scalene triangles

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Identifying lines of symmetry in 2D shapes

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Comparing & classifying isosceles and scalene triangles

Unit quizzes are being retired in August 2023

Intro quiz - Recap from previous lesson

Unit quizzes are being retired in August 2023

Intro quiz - Recap from previous lesson

Video

Worksheet

Unit quizzes are being retired in August 2023

Comparing and classifying isosceles and scalene triangles

Unit quizzes are being retired in August 2023

Comparing and classifying isosceles and scalene triangles

Lesson summary: Comparing & classifying isosceles and scalene triangles

It looks like you have not completed one of the quizzes.

Time to move!

The next lesson in: 2-D shape, perimeter and area is: Identifying lines of symmetry in 2D shapes

Browse Oak's lessons:

The next lesson in:
2-D shape, perimeter and area
is:
Identifying lines of symmetry in 2D shapes