1. Arc – Length – Bingo Method
Students should choose nine answers from the grid and place them
randomly into a 3x3 square in their book.
You may want to pause your display and choose questions
according to difficulty during the game.
Depending on time, students could win with
a line, an X, or a ‘full house’ (all).

2. Printing To print handouts from slides -
Select the slide from the left. Then click:
File > Print > ‘Print Current Slide’
To print multiple slides -
Click on a section title to highlight all those slides,
or press ‘Ctrl’ at the same time as selecting slides to
highlight more than one. Then click:
File > Print > ‘Print Selection’
To print double-sided handouts -
Highlight both slides before using ‘Print Selection’.
Choose ‘Print on Both Sides’ and ‘Flip on Short Edge’.

3. BINGO! 45 54 23 82 37 12 76 25 91
Lengths of Arcs

4. Choose your numbers…
33.3
11.4
9.1
13.2
9.0
26.3
6.6
25.9
17.4
4.1
44.1
21.7
22.8
8.4
31.2
28.2
Draw a 3x3 grid in your book.

5. Calculate the arc length.
(1 dp)
90°
4.2 cm
1 4 × π×2×4.2=
6.6 cm

6. Calculate the arc length.
(1 dp)
35°
6.7 cm
× π×2×6.7=
4.1 cm

7. Calculate the perimeter.
(1 dp)
6.7 cm
170°
× π×2×6.7=
33.3 cm
+ 2×6.7=

8. Calculate the arc length.
(1 dp)
8.4 cm
180°
1 2 × π×8.4=
13.2 cm

9. Calculate the arc length.
(1 dp)
4.6 cm
270°
3 4 × π×2×3.4=
21.7 cm

10. Calculate the arc length.
(1 dp)
5.8 cm
90°
1 4 × π×2×5.8=
9.1 cm

11. Calculate the arc length.
(1 dp)
150°
3.2 cm
× π×2×3.2=
8.4 cm

12. Calculate the perimeter.
(1 dp)
3.4 cm
3 4 × π×2×3.4=
22.8 cm
+ 2×3.4=

13. Calculate the arc length.
(1 dp)
310°
2.1 cm
× π×2×2.1=
11.4 cm

14. Calculate the perimeter.
(1 dp)
4.3 cm
6.8 cm
255°
× π×2×4.3=
25.9 cm
+ 6.8=

15. Calculate the arc length.
(1 dp)
7.7 cm
210°
× π×2×7.7=
28.2 cm

16. Calculate the perimeter.
(1 dp)
6.1 cm
300°
× π×2×6.1=
44.1 cm
+ 2×6.1=

17. Calculate the perimeter.
(1 dp)
7.4 cm
85°
5.2 cm
3.8 cm
× π×2×5.2=
26.3 cm
+ 18.6=

18. Calculate the perimeter.
(1 dp)
250°
4.9 cm
× π×2×4.9=
31.2 cm
+ 2×4.9=

19. Calculate the perimeter.
(1 dp)
3.7 cm
25°
× π×2×3.7=
9.0 cm
+ 2×3.7=

20. Calculate the perimeter.
(1 dp)
4.6 cm
1 4 × π×2×2.3=
17.4 cm
+ 13.8=

22. tom@goteachmaths.co.uk Questions? Comments? Suggestions?
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