Primary 4 Mathematics Geometry Quiz

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Primary 4 Mathematics Quiz - Geometry

Name: ___________________________
Class: _________
Date: ___________
Score: _______ / 40

Duration: 50 minutes
Total Marks: 40

Instructions:

1. This quiz has 20 questions on Geometry.
2. Section A: 10 short questions (1 mark each). Section B: 6 questions (2 marks each). Section C: 4 questions (3 marks each).
3. Show your working clearly where required.
4. Use a protractor and ruler if needed.

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Section A (Questions 1–10, 1 mark each)

1. What is the name of the angle that measures exactly $90^\circ$?

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2. Which of these angles is an obtuse angle? (Write A, B, or C)
A: $35^\circ$ B: $120^\circ$ C: $85^\circ$

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3. How many lines of symmetry does a square have?

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4. What is the angle sum of a triangle?
__________ $^\circ$

5. A net is folded to form a cube. How many square faces does the cube have?

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6. Write the angle notation for the angle at vertex B formed by points A, B, C.

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7. A rectangle has how many pairs of equal sides?

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8. Which 3D shape has a net made of 6 squares?

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9. An angle of $180^\circ$ is called a __________ angle.

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10. How many axes of symmetry does an equilateral triangle have?

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Section B (Questions 11–16, 2 marks each)

11. Measure the angle shown using a protractor.

Image pending generation: diagram for Q11.

Angle = __________ $^\circ$

12. Draw an angle of $45^\circ$ using a protractor. Label the vertex P.
(2 marks for correct drawing)

13. The diagram shows a triangle with angles $50^\circ$ and $60^\circ$. Find the third angle.

Image pending generation: diagram for Q13.

Third angle = __________ $^\circ$

14. A rectangle has length 8 cm and breadth 5 cm. Find its perimeter.
Perimeter = __________ cm

15. Which of the following nets can fold into a cube? Write the letter.

Image pending generation: diagram for Q15.

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16. A square has a side of 7 cm. Find its area.
Area = __________ cm$^2$

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Section C (Questions 17–20, 3 marks each)

17. A triangle has angles $x$, $2x$, and $3x$. Find the value of each angle. Show your working.
Working:
$x =$ __________ $^\circ$
$2x =$ __________ $^\circ$
$3x =$ __________ $^\circ$

18. The figure shows a composite shape of two rectangles. Rectangle A: 10 cm by 4 cm. Rectangle B: 6 cm by 4 cm attached to the right. Find total area.

Image pending generation: diagram for Q18.

Total area = __________ cm$^2$

19. Draw all lines of symmetry for the given shape (a rectangle). How many did you draw?
(3 marks: 2 for drawing, 1 for count)
Number = __________

20. A net of a cube is shown with 5 faces numbered 1 to 5. Which face will be opposite face 3 when folded?

Image pending generation: diagram for Q20.

Opposite face = __________

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Primary 4 Mathematics Quiz - Geometry (Answer Key)

Total Marks: 40
Topic: Geometry (syllabus-first, no past-paper evidence used)

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Section A Answers (1 mark each)

1. Right angle
Teaching note: An angle of exactly $90^\circ$ is called a right angle. It looks like the corner of a square.

2. B
Teaching note: Obtuse angles are greater than $90^\circ$ but less than $180^\circ$. $120^\circ$ fits. A and C are acute.

3. 4
Teaching note: A square has 4 equal sides and 4 right angles; it can be folded along 4 lines (vertical, horizontal, two diagonals).

4. 180
Teaching note: The sum of angles in any triangle is always $180^\circ$. This is a key geometry fact.

5. 6
Teaching note: A cube has 6 faces, all squares. Its net must contain 6 squares.

6. $\angle ABC$
Teaching note: Angle notation uses three letters with vertex in middle: $\angle ABC$ means angle at B formed by BA and BC.

7. 2
Teaching note: Rectangle has opposite sides equal: 2 pairs (lengths equal, breadths equal).

8. Cube
Teaching note: A cube's net is made of 6 squares arranged so they fold into a closed box.

9. Straight
Teaching note: $180^\circ$ is a straight line angle, called straight angle.

10. 3
Teaching note: Equilateral triangle has 3 equal sides and 3 lines of symmetry (each from vertex to midpoint of opposite side).

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Section B Answers (2 marks each)

11. $65^\circ$ (accept $63^\circ$–$67^\circ$ if drawing slight error)
Working: Place protractor centre at O, align base with OA, read where OB crosses scale.
Marking: 2 marks for correct reading.

12. Drawing of $45^\circ$ with vertex P
Marking: 2 marks: 1 for correct angle size, 1 for label P.
Teaching note: Use protractor: draw base line, mark $45^\circ$ point, join to vertex.

13. $70^\circ$
Working: $180^\circ - 50^\circ - 60^\circ = 70^\circ$.
Marking: 2 marks: 1 for method, 1 for answer.

14. Perimeter = 26 cm
Working: $P = 2 \times (l + b) = 2 \times (8 + 5) = 2 \times 13 = 26$ cm.
Marking: 2 marks: 1 method, 1 answer.

15. C
Teaching note: Only cross-shaped net of 6 squares folds into cube without overlap.
Marking: 2 marks for correct choice.

16. Area = 49 cm$^2$
Working: $A = s \times s = 7 \times 7 = 49$ cm$^2$.
Marking: 2 marks: 1 method, 1 answer.

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Section C Answers (3 marks each)

17.
Working:
$x + 2x + 3x = 180^\circ$
$6x = 180^\circ$
$x = 30^\circ$
$2x = 60^\circ$
$3x = 90^\circ$
Answers: $x=30^\circ$, $2x=60^\circ$, $3x=90^\circ$
Marking: 3 marks: 1 for equation, 1 for x, 1 for other two.

18. Total area = 64 cm$^2$
Working:
Area A = $10 \times 4 = 40$ cm$^2$
Area B = $6 \times 4 = 24$ cm$^2$
Total = $40 + 24 = 64$ cm$^2$
Marking: 3 marks: 1 each step.

19. Number = 2
Marking: 2 marks for drawing 2 symmetry lines (vertical, horizontal), 1 for count.
Teaching note: Rectangle (non-square) has only 2 lines of symmetry.

20. Face 2
Teaching note: In cross net, centre face 3 opposite the face directly across from it when folded (face 2).
Marking: 3 marks: 1 for reasoning, 2 for correct face.