4. L=1/4 ×22/7×14×14
=1/4 × 616
=154×2
=308
k=1/4 × 2 × 22/7 × 14
=1/2 × 2 × 22/7 ×14
=44+(14×4)
=44+56
=100
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4. L=1/4 ×22/7×14×14
=1/4 × 616
=154×2
=308
k=1/4 × 2 × 22/7 × 14
=1/2 × 2 × 22/7 ×14
=44+(14×4)
=44+56
=100