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4.The length of side is 30cm
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- 1/2*(20+x)*16=400
- 8*(20+x)=400
- 20+x=400/8
- x=50-20
- x=30
3. 1/2*(12+8)*x=40
- 1/2*20*x=40
- 10*x=40
- x=4
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