3. k = π × d × 1/2
= 22/7 × 42 × 1/2
= 132 × 1/2
= 66
5. k = π × d × 1/2
= 22/7 × 56 × 1/2
= 176 × 1/2
= 88
maaf cmn bisa bantu segitu
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3. k = π × d × 1/2
= 22/7 × 42 × 1/2
= 132 × 1/2
= 66
5. k = π × d × 1/2
= 22/7 × 56 × 1/2
= 176 × 1/2
= 88
maaf cmn bisa bantu segitu