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The first volume of the third grade of Jiangsu Education Edition 1 Mathematical Synchronization Exercise 3 Understanding Rectangular and Square Answers.
Answer: 1, (1) 4; 2; 4; 4; right angle

(2) rectangular; square

2. Omission

3、( 1)7; 4; 6; 6; six

(2) Omission

(3) Omission

4, 6 cm; 8 cm; 6cm； 8 cm; 12cm

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