P=15+(16-9)+21+9+(15+21)+16=15+7+21+9+36+16=104 дм
S=15*16+21*9=240+189=429 дм²
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P=15+(16-9)+21+9+(15+21)+16=15+7+21+9+36+16=104 дм
S=15*16+21*9=240+189=429 дм²