Yangtze river operator education printing plate sixth grade mathematics answer 17~40

1, fill in. (1) Half circumference, radius, πr? (2)4 times (3)9 times (4)3 14

2. Judges. ×√√√

3. Find the area of the circle (1) (18.84/3.14.2)? *3. 14=28.26 (m2) (2)(20/2)？ *3. 14=3 14 (square centimeter) (3)6? * 3.14 =113.04 (square decimeter)

4，3.768/3 14/2 = 0.6(m)3. 14 * 0.6？ ≈ 1. 13 (m2)

5、(98/2)? *3. 14=7539. 14 (m2)

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