[tex]a).tt = \sqrt{ {rt}^{2} - ( { \frac{s}{2} )}^{2} } \\ \sqrt{ {26}^{2} - ( { \frac{20}{2} )}^{2} } = \sqrt{ {20}^{2} - {10}^{2} } \\ \sqrt{676 - 100 } = \sqrt{576} = 24 \: cm \\ \\ \\ b). LP \: limas \: persegi \\ 2 \times s( \frac{s}{2} + tt) \\ 2 \times 20( \frac{20}{2} + 24) \\ 40(10 + 24) \\ 40(34) \\ 1.360 \: {cm}^{2} [/tex]
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[tex]a).tt = \sqrt{ {rt}^{2} - ( { \frac{s}{2} )}^{2} } \\ \sqrt{ {26}^{2} - ( { \frac{20}{2} )}^{2} } = \sqrt{ {20}^{2} - {10}^{2} } \\ \sqrt{676 - 100 } = \sqrt{576} = 24 \: cm \\ \\ \\ b). LP \: limas \: persegi \\ 2 \times s( \frac{s}{2} + tt) \\ 2 \times 20( \frac{20}{2} + 24) \\ 40(10 + 24) \\ 40(34) \\ 1.360 \: {cm}^{2} [/tex]