9514 1404 393
Answer:
1.4.1 35.34 mm²
1.4.2 113.10 mm
Step-by-step explanation:
1.4.1 There are 5 circles in the first two patterns. The area of one circle in terms of its diameter is ...
A = (π/4)d²
Then the area of the 5 circles is ...
A = 5(π/4)(3 mm)² = 45π/4 mm² ≈ 35.34 mm²
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1.4.2 There are 12 circles in the first 3 patterns. The perimeter of one circle is given by the formula ...
P = πd
Then the total perimeter of the 12 circles is ...
P = 12π(3 mm) = 36π mm ≈ 113.10 mm
