4. 1

6. 60

8. 60 ÷12=5

10. 5x6=30

12. One half

14. Half past twelve

16. 5x3=15

18. One quarter

20. Quarter past twelve

22. 5x3=15

24. One quarter

26. Quarter till one

29. A circle

31. 360°

33. 60

35. 360°÷60=6°

37. 5

39. 6°x5=30°

41. 15

43. 6°x15=90°

45. A triangle

47. 90°

49. Yes, a right triangle is a triangle with one 90° angle.

51. 180°-90°= 90° 90°÷2=45°

53. yes

55. Yes, an isosceles triangle is a triangle with two equal sides and two equal angles.

57. 6°x10=60°

59. A triangle

61. 60°

63. 180°-60°= 120° 120°÷2=60°

65. Yes, a triangle with three 60° angles is an equilateral triangle.