[tex]21. \: \frac{1}{2} \times 8 \times 16 = 64cm {}^{2} \\ \\ 22. \sqrt[3]{1331} = 11dm \\ \\ 23. \frac{22}{7} \times 63 = 198cm {}^{2} [/tex]
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[tex]21. \: \frac{1}{2} \times 8 \times 16 = 64cm {}^{2} \\ \\ 22. \sqrt[3]{1331} = 11dm \\ \\ 23. \frac{22}{7} \times 63 = 198cm {}^{2} [/tex]