Huanggang Small Champion People's Education Edition Primary School Grade Six Mathematics Volume I p43 Calculation Heaven Answer
Computing heaven:
1.( 1) 35.7 cm 10.75 cm2
(2) Circumference: 3.14 * 4/1+3.14 * 4/2+4 =13.42 cm.
Area: 3.14 * 4 * 8/1-4 * (4/2)/2 = 2.28cm2.