New
New
Year 7

# Describing a rotation's direction and size

I can understand the size and direction of rotation.

New
New
Year 7

# Describing a rotation's direction and size

I can understand the size and direction of rotation.

## Lesson details

### Key learning points

1. Rotations can be either clockwise or anti-clockwise.
2. The size of the rotation is given in degrees.

### Common misconception

"Right means clockwise" and "left means anti-clockwise"

This is only true when referencing the top of the object being rotated. Rotating "left" and "right" is incorrect for all other vertices.

### Keywords

• Clockwise - Clockwise is the direction that the hands of an analogue clock travel.

• Anti-clockwise - Anti-clockwise is the opposite direction to which the hands of an analogue clock travel.

• Degrees - The most common unit of measurement for angle. One whole turn is equal to 360 degrees, written 360°.

In the Cycle 2 , it is important to note that there are infinitely many answers (you can continue rotating the object through full turns) - this is why it states each rotation is under 360° (or one full turn).
Teacher tip

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
In which direction will this car be facing when it is rotated so its wheels touch the road?
right
Q2.
Which of these objects, when rotated by a quarter-turn, will fit into the space of this shape to complete a rectangle?
Correct Answer: An image in a quiz
Q3.
Complete this sentence: "When an object is rotated, the size of its angles are invariant. This means the lengths of the sides remain ."
Correct Answer: invariant, the same, same, identical, unchanged
Q4.
Sam transforms an object and its orientation has not changed. Which of these describes why the orientation has not changed?
The object has been rotated to become its image.
Correct answer: The object has been translated to become its image.
The object has been reflected to become its image.
Correct answer: The object has been rotated by a full turn.
The object has been rotated by less than a full turn.
Q5.
Which of these is a rotation of this object?
image 1
image 4
image 5
Q6.
Which of these is a rotation of this object?
image 2
image 4

## Exit quiz

### 6 Questions

Q1.
In which direction is this object being rotated?
anti-clockwise
the object is not being rotated
Q2.
This arrow is currently pointing in the W (west) compass direction. If this arrow is rotated anti-clockwise, what is the first compass direction that it passes through?
N (north)
E (east)
W (west)
Q3.
Match the size an angle in degrees to its description.

a quarter turn

a half turn

a three-quarter turn

a full turn

two full turns

Q4.
Jun stands on the spot and rotates clockwise by a quarter turn, and then rotates clockwise by a further three-quarter turn. In total, how many degrees has Jun rotated by?
Correct Answer: 360, 360°, 360 degrees
Q5.
Jun stands on the spot and rotates anti-clockwise by an angle between three-quarters of a full turn and one full turn. Which of these is a sensible answer for the size of Jun's rotation?
30°
150°
210°