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What should I do with the title of the first grade mathematics volume I 79 1 1 in Jiangsu Education Edition 20 12?
Area: 10× 10-4×6=76 (square centimeter)

Circumference: 10+ 10+4+6+4+6=40 (cm)

Area: 10× 10-4×6=76 (square centimeter)

Circumference:10+10+10+6+4+4 = 48 (cm)

Area: 10× 10-4×6=76 (square centimeter)

Circumference:10+10+10+4+6+6 = 52 (cm)

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