# Building shapes from triangles (Part 1)

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## Lesson details

### Key learning points

- 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.

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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

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

### 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'?

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

Isosceles triangle

Scalene triangle

Q5.

If you were to have 6 separate equilateral triangles , what would the total interior angles of all the triangles sum to?

10,800 degrees

180 degrees

60 degrees