Answer:
1. formula and solution: P=a+b+c=10+10+10
answer: 30 cm²
2. formula and solution: P=s+s+s+s=12+12+12+12
answer: 48 cm²
3. formula and solution: P=2(l+w)=2×(8+15)
answer: 46 cm²
4. formula and solution: P=bh=12×5
answer: 60 cm²
5. formula and solution: P=(b+h)÷2×h=(55+15)÷2×25
answer: 875 m²
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Answer:
1. formula and solution: P=a+b+c=10+10+10
answer: 30 cm²
2. formula and solution: P=s+s+s+s=12+12+12+12
answer: 48 cm²
3. formula and solution: P=2(l+w)=2×(8+15)
answer: 46 cm²
4. formula and solution: P=bh=12×5
answer: 60 cm²
5. formula and solution: P=(b+h)÷2×h=(55+15)÷2×25
answer: 875 m²