Keliling 1/2 lingkaran + 2p + l
[tex] (\frac{1}{2} \times \pi \times d) +( 2 \times p + l )\\ \\ ( \frac{1}{2} \times \frac{22}{7} \times 70 )+( 2 \times 75 + 70) \\ \\ 110 + 220 \\ \\ 330 \: cm \: (b)[/tex]
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Keliling 1/2 lingkaran + 2p + l
[tex] (\frac{1}{2} \times \pi \times d) +( 2 \times p + l )\\ \\ ( \frac{1}{2} \times \frac{22}{7} \times 70 )+( 2 \times 75 + 70) \\ \\ 110 + 220 \\ \\ 330 \: cm \: (b)[/tex]