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Kiám-chhái îⁿ-khoân tùi-sim kàu kîⁿ = h, chīu.
- 1° Kîⁿ chi̍t-îⁿ = h2×3·1416.
- 2° Khoân-lāi ê pêng-hong-chek = h×h×3·1416.
Kiám-chhái tùi kiû-sim kàu bīn-téng = h chīu kiû-bīn ê pêng-hong-chek = 4 h×h×3·1416.
- Chhia-lûn tùi sim kàu kîⁿ 1 chhioh chīu lìn chi̍t-ê ōe kiâⁿ kúi-chhioh? Koh, kiâⁿ chi̍t-phò͘-lō͘ tio̍h lìn kúi-pái?
Khó-kiàn tio̍h lìn lîm-lîm-á 2865 pái.
- Thian-bun-koán ū chi̍t-keng îⁿ-îⁿ, tùi tiong-ng ti̍t-ti̍t kè ū 4 tn̄g. Bóe pang 1 chhioh khoah 2 tn̄g ta̍t chi̍t-kho͘-gûn, chīu hit-keng ê tōe-pán ta̍t kúi-kho͘?
- Ēng iû-pháng-si thang tsòe kiû, kek-khì hō͘-i móa chīu thiⁿ-tiong ōe phû. Kiám-chhái tùi kiû ê tiong-sim kàu bīn-téng 6 tn̄g chīu pháng-si 1 bā khoah tio̍h kúi-bā?
Kiû-bīn = 4 × 60 × 60 × 3·1416 chhioh. Chi̍t-bā = 3 chhioh, chīu chi̍t-bā pêng-hong = 3×3=9 pêng-hong-chhioh. Khó-kiàn só͘-tio̍h ēng ê si 解析失敗 (語法錯誤): {\displaystyle = \frac{4×60×60×3·1416}{9}=5026·56 } bā. Thang liān ê siàu.
- Kiám-chhái tùi tōe-kiû ê sim kàu bīn-téng 13000 lí chīu lâi se̍h tōe-kiû kúi-lí? Tek 81681・6.
- Tōe-kiû bīn-téng kiōng kúi-bó͘? Tek 1146809664000.
- Kiám-chhái tùi ji̍t-thâu bīn-téng tsǹg kè tiong-sim kàu bīn-téng ū 2940000 lí, chīu kiâⁿ se̍h ji̍t-thâu chi̍t-pái-kúi-lí? Tek 9236304.