Lesson T4.4.3

T4.4.3 Similarity and enlargement Quiz: KS3 Maths, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson T4.4.3, Similarity and enlargement: 20 multiple choice questions for the KS3 Maths (National Curriculum), Unit 4: Geometry and measures, written with Revision Ninja.

Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.

Host this setFree Play

The 20 questions

  1. Similar shapes are what?

    • Identical in size and shape
    • Same area
    • Same shape but different size
    • Same size but different shape

  2. An enlargement with scale factor 3 means what?

    • Each length is multiplied by 3
    • Each length is divided by 3
    • Each angle is multiplied by 3
    • Each length has 3 added to it

  3. A rectangle 4 cm by 6 cm is enlarged by scale factor 2. What are its new dimensions?

    • 6 cm by 8 cm
    • 8 cm by 12 cm
    • 12 cm by 18 cm
    • 2 cm by 3 cm

  4. What does a scale factor of one half mean?

    • A reduction to half the size
    • An enlargement by 2
    • A rotation of the shape
    • No change in size

  5. A triangle with sides 3, 4 and 5 cm is enlarged by scale factor 3. What are the new sides?

    • 6, 7 and 8 cm
    • 9, 4 and 5 cm
    • 3, 12 and 15 cm
    • 9, 12 and 15 cm

  6. In similar triangles, what is true of corresponding angles?

    • They are equal
    • They are random
    • They add up to 180 degrees
    • They are doubled

  7. A length of 4 cm on one shape becomes 10 cm on a similar shape. What is the scale factor?

    • 0.4
    • 40
    • 6
    • 2.5

  8. A length of 12 cm is scaled by 0.25. What is the new length?

    • 3 cm
    • 12.25 cm
    • 48 cm
    • 0.3 cm

  9. What is the centre of enlargement?

    • The midpoint of the longest side of the shape
    • A point that is not on the shape or its image
    • The corner of the shape that is enlarged first
    • The fixed point that lines are scaled from

  10. Which quantity is NOT changed by an enlargement?

    • Areas
    • Angles
    • Lengths
    • Perimeters

  11. A map has scale 1 cm to 20 m. A path is 7 cm long on the map. What is its real length?

    • 1400 m
    • 140 m
    • 27 m
    • 2.8 m

  12. A photo is 6 cm wide and is enlarged by scale factor 4. What is the new width?

    • 24 cm
    • 10 cm
    • 1.5 cm
    • 2.4 cm

  13. A shape has area 5 cm². It is enlarged by scale factor 2. What is the new area?

    • 20 cm²
    • 25 cm²
    • 10 cm²
    • 7 cm²

  14. Triangle A has a side of 5 cm and a similar triangle B has the matching side 8 cm. What is the scale factor from A to B?

    • 1.6
    • 13
    • 3
    • 0.625

  15. Shape A has area 9 cm². A similar shape B has a scale factor of 3 for lengths. What is the area of B?

    • 9 cm²
    • 81 cm²
    • 27 cm²
    • 3 cm²

  16. A triangle with angles 40, 60 and 80 degrees is enlarged. What are its angles now?

    • Doubled to 80, 120 and 160 degrees
    • Still 40, 60 and 80 degrees
    • Halved to 20, 30 and 40 degrees
    • Each becomes 60 degrees

  17. A rectangle is 4 cm by 10 cm. A similar rectangle has width 6 cm. What is its length?

    • 16 cm
    • 6.67 cm
    • 60 cm
    • 15 cm

  18. Which two shapes are always similar?

    • Two rectangles
    • Two equilateral triangles
    • Two kites
    • Two parallelograms

  19. A model car is made at a scale of 1 to 20. The real car is 4 m long. How long is the model?

    • 20 cm
    • 2 cm
    • 5 cm
    • 80 cm

  20. A shape is enlarged by scale factor 2 from a fixed centre. A point is 3 cm from the centre. What is its new distance from the centre?

    • 5 cm
    • 1.5 cm
    • 6 cm
    • 9 cm

All KS3 Maths quizzes