Year 8

# Building shapes from triangles (Part 2)

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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 2 of a two-part lesson.

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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'?

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

### 5 Questions

Q1.

ABCD forms a quadrilateral. What are the total interior angles of the quadrilateral?

180 degrees

36 degrees

90 degrees

Q2.

Angle ABC is 98 degrees. What would the size of the reflex angle formed be on the exterior?

2 degrees

360 degrees

82 degrees

Q3.

If I combined two equilateral triangles together with a shared side, what would the shape formed be called?

Equilateral triangle

Rectangle

Square

Q4.

Which of the following is not a rule used so far for angles?

Angles on a straight line sum to 180 degrees

Interior angles in a triangle sum to 180 degrees

Q5.

If A + B + C = 180, D + E = 180 and F is a right angle, what does A + B + C + D + E + F equal?

180 degrees

360 degrees

540 degrees