1. P=2a+b
P=2×8+13=16+13=29 см
2. P=2a+b
a=(P-b)/2
a=(39-15)/2=24/2=12 см
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1. P=2a+b
P=2×8+13=16+13=29 см
2. P=2a+b
a=(P-b)/2
a=(39-15)/2=24/2=12 см