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5.)L=1/4×phi×r×r
L=1/4×3,14×350×350
L=1/4×384.650
L=96.162,5 cm^2
7.)L=3,14×6×6
L=113,04 cm^2
=22/7×441=9702÷7=1386cm²
7. (πr²)÷2=3,14×6²
=3,14×36=113,04÷2=56,52
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