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A=1/3h (a+4b+c) a=20 h =5 a=1 c=1
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A=1/3h (a+4b+c) a=20 h =5 a=1 c=1

User Rayncorg
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A=1/3h (a+4b+c) \\20=1/3(5)(1+4b+1) \\20=1/3(5+20b+5) \\60=10+20b \\50=20b \\b=50/20 \\b=2.5
User Rumata
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