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).

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

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.

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

Calculate the arc length. (1 dp) 35° 6.7 cm 35 360 × π×2×6.7= 4.1 cm

Calculate the perimeter. (1 dp) 6.7 cm 170° 170 360 × π×2×6.7= 33.3 cm + 2×6.7=

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

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

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

Calculate the arc length. (1 dp) 150° 3.2 cm 150 360 × π×2×3.2= 8.4 cm

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

Calculate the arc length. (1 dp) 310° 2.1 cm 310 360 × π×2×2.1= 11.4 cm

Calculate the perimeter. (1 dp) 4.3 cm 6.8 cm 255° 255 360 × π×2×4.3= 25.9 cm + 6.8=

Calculate the arc length. (1 dp) 7.7 cm 210° 210 360 × π×2×7.7= 28.2 cm

Calculate the perimeter. (1 dp) 6.1 cm 300° 300 360 × π×2×6.1= 44.1 cm + 2×6.1=

Calculate the perimeter. (1 dp) 7.4 cm 85° 5.2 cm 3.8 cm 85 360 × π×2×5.2= 26.3 cm + 18.6=

Calculate the perimeter. (1 dp) 250° 4.9 cm 250 360 × π×2×4.9= 31.2 cm + 2×4.9=

Calculate the perimeter. (1 dp) 3.7 cm 25° 25 360 × π×2×3.7= 9.0 cm + 2×3.7=

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

tom@goteachmaths.co.uk Questions? Comments? Suggestions? …or have you found a mistake!? Any feedback would be appreciated . Please feel free to email: tom@goteachmaths.co.uk