Year 6

Year 6

# Find unknown angles in triangles

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## Slide deck

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## Lesson details

### Key learning points

1. In this lesson, we will represent the angles in a triangle pictorially and algebraically before learning how to calculate missing angles.

### 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.
What shape is being described below?
Correct answer: Parallelogram
Square
Trapezium
Q2.
Select the correct description of a trapezium.
A quadrilateral with four equal sides and four right angles.
Correct answer: A quadrilateral with only one pair of parallel sides.
A quadrilateral with two pairs of equal sides and two pairs of equal angles
Q3.
The interior angles in a quadrilateral add up to:
180°
Correct answer: 360°
90°
Q4.
What is the value of the missing angle?
145°
Correct answer: 35°
45°
Q5.
If a parallelogram has a perimeter of 6cm, what are the lengths of the sides?
1cm, 1cm, 1cm, 3cm
Correct answer: 1cm, 2cm, 1cm, 2cm
2cm, 3cm, 1cm, 0cm

## Exit quiz

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### 3 Questions

Q1.
What is the value of angle a?
124°
236°
Correct answer: 56°
Q2.
What is the value of angle a?
160°
Correct answer: 20°
200°
Q3.
What is the value of angle y?
145°
Correct answer: 35°
85°