Answer:
area 400cm²
1/(a+b)h= 1/2×(20+b)×16=400cm²
(20+b)=400×2/16=50
b=50-20=30
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Answer:
area 400cm²
1/(a+b)h= 1/2×(20+b)×16=400cm²
(20+b)=400×2/16=50
b=50-20=30