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Primary 4 Mathematics · Chapter 7 · Revision paper

Chapter 7 Revision Paper: Angles

Name:Date:Marks:    / 30

Time: 40 minutes. Calculators are not allowed. Show your working in Section C.

Section A · Multiple choice 10 marks

1. Which angle is an obtuse angle?1 mark

Angle WAngle XAngle YAngle Z
(A) Angle Y(B) Angle W(C) Angle X(D) Angle Z

2. Which statement is true?1 mark

(A) An obtuse angle is smaller than a right angle.(B) Two right angles make a straight line.(C) An acute angle is bigger than a right angle.(D) A right angle is 180°.

3. The minute hand of a clock moves from 12 to 9 (clockwise). What angle does it turn through?1 mark

(A) 90°(B) 180°(C) 270°(D) 360°

4. Which is the correct name of the marked angle?1 mark

DEF
(A) ∠EDF(B) ∠DFE(C) ∠FDE(D) ∠DEF

5. In the figure, ∠AOB = 40° and ∠BOC = 50°. Which angle is a right angle?1 mark

ABCO
(A) ∠AOC(B) ∠AOB(C) ∠BOC(D) ∠ABC

6. What is the size of the angle?1 mark

01801017020160301504014050130601207011080100909010080110701206013050140401503016020170101800ABC
(A) 55°(B) 125°(C) 135°(D) 115°

7. Dev measured an obtuse angle. He read 70° on one scale and 110° on the other scale. What is the size of the angle?1 mark

(A) 70°(B) 180°(C) 110°(D) 40°

8. Ria wants to draw ∠XYZ = 65°. The arm YX points to the right, on 0 of the baseline. Which scale should she use?1 mark

(A) the inner scale, which starts at 0 on the left(B) the scale that gives the bigger number(C) it does not matter which scale she uses(D) the outer scale, which starts at 0 on the right

9. What is the best estimate of the size of this angle?1 mark

(A) 135°(B) 45°(C) 90°(D) 170°

10. Rina is drawing ∠ABC. The arm BA is on 0 at the left. She puts a dot at the red dot and will join it to B. What size of angle will she draw?1 mark

01801017020160301504014050130601207011080100909010080110701206013050140401503016020170101800AB
(A) 135°(B) 45°(C) 55°(D) 35°

Section B · Short answers 4 marks

11. How many right angles make a three-quarter turn?1 mark

12. Name the marked angle.1 mark

WXYZ

13. What is the size of ∠XYZ?1 mark

01801017020160301504014050130601207011080100909010080110701206013050140401503016020170101800XYZ

14. Using a ruler and a protractor, draw ∠KLM = 125°. The line LK is drawn for you.1 mark

KL

Section C · Show your working 16 marks

15. A door is opened through an angle of 65°. It is then opened a further 40°. (a) What is the angle now? (b) Is the angle acute, right or obtuse?2 marks

16. (a) Name the three marked angles in triangle FGH. (b) Which of them is the obtuse angle?2 marks

FGH

17. OA lies along the baseline of the protractor. Find ∠BOC. Is it acute, right or obtuse?2 marks

01801017020160301504014050130601207011080100909010080110701206013050140401503016020170101800AOBC

18. Ria says ∠XYZ is 105° because the arm is at 105 on the inner scale. Is she correct? What is the size of ∠XYZ?2 marks

01801017020160301504014050130601207011080100909010080110701206013050140401503016020170101800XYZ

19. Draw ∠AOB = 45°. Then draw ∠BOC = 65° next to it, so that OB is between OA and OC. What is the size of ∠AOC? Is it acute, right or obtuse?2 marks

AO

20. (a) Name the angle shown in the figure, using the letters E, F and G. (b) What is its size?2 marks

01801017020160301504014050130601207011080100909010080110701206013050140401503016020170101800EFG

21. In the figure, ∠AOB = 25°. ∠BOC is 3 times as big as ∠AOB. ∠COD = 20°. (a) Find ∠AOC. (b) Find ∠AOD. Is it acute, right or obtuse?2 marks

ABCDO

22. ∠AOD is a right angle. ∠AOB = 25°. ∠BOC is 20° bigger than ∠AOB. (a) Find ∠COD. (b) Find ∠BOD.2 marks

ABCDO
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