Year 8

Year 8

# Building shapes from triangles (Part 1)

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## Lesson details

### Key learning points

1. In this lesson, we will learn how to arrange triangles to form polygons as part of an investigation into the internal angles of polygons. This represents part 1 of a two-part lesson.

### Licence

This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

## Video

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## Worksheet

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## Starter quiz

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### 5 Questions

Q1.
Which of the following statements most accurately describes an 'obtuse angle'?
An angle less than 90 degrees
An angle that is 90 degrees
Correct answer: An angle that is between 90-180 degrees
An angle that is greater than 180 degrees
Q2.
Which of the following statements most accurately describes an 'acute angle'?
Correct answer: An angle less than 90 degrees
An angle that is 90 degrees
An angle that is between 90-180 degrees
An angle that is greater than 180 degrees
Q3.
Which of the following statements most accurately describes a 'regular polygon'
A shape with 2 or less sides that are equal
A shape with 2 or less sides that are not equal
Correct answer: A shape with 3 or more sides that are equal
A shape with 3 or more sides that are not equal
Q4.
A rhombus is an example of a...
Hexagon
Nonagon
Triangle
Q5.
Another word for a regular quadrilateral would be...
Rectangle
Rhombus
Trapezium

## Exit quiz

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### 5 Questions

Q1.
Each angle in an equilateral triangle is...
180 degrees
6 degrees
90 degrees
Q2.
Which of the following statements most accurately describes an 'acute angle'?
Correct answer: An angle less than 90 degrees
An angle that is 90 degrees
An angle that is between 90-180 degrees
An angle that is greater than 180 degrees
Q3.
The total interior angles in a quadrilateral sum to...
180 degrees
45 degrees
90 degrees
Q4.
If I wanted to describe a regular triangle, it would be better to say which of the following?
Equal triangle