Answer:
6. A = 4πr²
= 4(3.14)(7.5cm)²
= 4(3.14)(56.25cm²)
= 4(176.63cm²)
7. A = a² + 2al
= (25dcm)² + 2(25dcm)(21dcm)
= 625dcm² + 2(525dcm²)
= 625dcm² + 1050dcm²
8. A = 6a²
= 6(4.7ft)²
= 6(22.09ft²)
9. A = 2πr(r + h)
= 2(3.14)(0.8m)(0.8m + 7m)
= 2(3.14)(0.8m)(7.8m)
= 2(3.14)(6.24m²)
= 2(19.59m²)
10. A = 2(lw + lh + wh)
= 2((35cm)(27cm) + (35cm)(1.8cm) + (27cm)(1.8cm))
= 2(945cm² + 63cm² + 48.6cm²)
= 2(1056.6cm²)
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Answers & Comments
Answer:
6. A = 4πr²
= 4(3.14)(7.5cm)²
= 4(3.14)(56.25cm²)
= 4(176.63cm²)
A = 706.50cm² (A)
7. A = a² + 2al
= (25dcm)² + 2(25dcm)(21dcm)
= 625dcm² + 2(525dcm²)
= 625dcm² + 1050dcm²
A = 1675dcm² (C)
8. A = 6a²
= 6(4.7ft)²
= 6(22.09ft²)
A = 132.54ft² (D)
9. A = 2πr(r + h)
= 2(3.14)(0.8m)(0.8m + 7m)
= 2(3.14)(0.8m)(7.8m)
= 2(3.14)(6.24m²)
= 2(19.59m²)
A = 39.19m² (D)
10. A = 2(lw + lh + wh)
= 2((35cm)(27cm) + (35cm)(1.8cm) + (27cm)(1.8cm))
= 2(945cm² + 63cm² + 48.6cm²)
= 2(1056.6cm²)
A = 2113.2cm² (B)