Circle P6 2010 SA2 CHIJ P2 Q13

4 x 2 + 3 x 2 = 14

1/4 x 2 x 3.14 x 4 = 6.28

1/2 x 2 x 3.14 x 3 = 9.42

14 + 6.28 + 9.42 = 29.7 cm

a) It was 29.7 cm.

1/4 x 3.14 x 4 x 4 = 12.56           A + B

1/2 x 3.14 x 3 x 3 = 14.13           C + B

14.13 - 12.56 = 1.57 cm2.