Year 8

# Categorising and defining polygons

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## Lesson details

### Key learning points

- In this lesson, we will learn about the key terminology involved in describing polygons, and begin to categorise polygons, based on certain properties.

### 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.

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### 5 Questions

Q1.

The total sum of the interior angles in a triangle is...

360 degrees

45 degrees

90 degrees

Q2.

A right angled triangle with one angle as 23 degrees would mean the remaining interior angle would be...

157 degrees

180 degrees

77 degrees

Q3.

In an equilateral triangle, each interior angle would be equal to...

180 degrees

3 degrees

90 degrees

Q4.

If a base angle of an isosceles triangle was 34 degrees, what would the other base angle be?

146 degrees

56 degrees

66 degrees

Q5.

If the base angles of an isosceles triangle were 34 degrees, what would the unknown angle be?

34

66

68

### 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

An angle that is greater than 180 degrees

Q2.

Which of the following statements most accurately describes an 'acute angle'?

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

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