New
New
Year 7

# Checking understanding of basic transformations

I can describe how an object has moved or changed.

New
New
Year 7

# Checking understanding of basic transformations

I can describe how an object has moved or changed.

## Lesson details

### Key learning points

1. A congruent shape has not changed size
2. Two shapes can be congruent even if one has been reflected or rotated
3. An image can be described in terms of its object
4. The description states how the object has been changed

### Common misconception

Students may believe two shapes are congruent based purely on the shape and not the size as well.

Consider squares - all squares have the same angles and are visually identical but if the lengths are different they're not congruent.

### Keywords

• Object - The object is the starting figure before a transformation has been applied.

• Image - The image is the resulting figure after a transformation has been applied.

• Transformation - A transformation is a process that may change the size, orientation or position of a shape.

• Congruent - If one shape can fit exactly on top of another using rotation, reflection or translation, then the shapes are congruent.

• Invariant - A property of a shape is invariant if that property has not changed after the shape is transformed.

Students could describe verbally to each other. Using MWBs, students could make a description and the other student would need to draw the image based upon the description.
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.
Which is bigger: 4.2 cm or 4 cm?
4 cm
Q2.
In this triangle, the largest interior angle is located at which vertex?
A
C
Q3.
A half turn means __________ \$\$^{\circ}\$\$
\$\${90^{\circ}}\$\$
\$\${270^{\circ}}\$\$
Q4.
Match the edges to the correct lengths.

4.9 cm

5.4 cm

3.3 cm

5.8 cm

Q5.
pentagon
triangle
Q6.
The vertices in the quadrilateral PQRS has been labelled in the direction.

## Exit quiz

### 6 Questions

Q1.
A transformation is a process that may change the size, orientation or of a shape.
Q2.
This L shape is flipped over once, which of these could be the image?
Correct Answer: An image in a quiz
Correct Answer: An image in a quiz
Q3.
The quadrilateral ABCD is transformed. How should the image of vertex A be labelled?
Correct Answer: A', A dash, A prime, A`
Q4.
Which of these show a pair of congruent shapes?
Correct Answer: An image in a quiz
Q5.
Regardless of whether an object is flipped, twisted or moved which properties are invariant?