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10 cards from this deck
A=πr2A = \pi r^2A=πr2
Always radius, never diameter
Divide diameter by 2
12×π×r2\frac{1}{2} \times \pi \times r^221×π×r2
Exactly half
Can earn method marks even if final answer is wrong
Using diameter instead of radius
cm² or mm²
Divide by 2 to convert to radius
1 d.p., 3 s.f., nearest cm²/mm², or exact in terms of π\piπ
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