[tex]t \: ∆ = \sqrt{ {r}^{2} - ( \frac{1}{2}tb) {}^{2} } = \sqrt{ {20}^{2} - ( \frac{1}{2} .24) {}^{2} } \\ \sqrt{ {20}^{2} - {12}^{2} } = \sqrt{400 - 144} = \sqrt{256} = 16 \\ \\ luas \: tembereng \\ ( \frac{ \alpha }{360} \times \pi \times r \times r) - ( \frac{1}{2} \times a \times t \: ∆) \\ ( \frac{72}{360} \times 3,14 \times 20 \times 20) - ( \frac{1}{2} \times 24 \times 16) \\ 251,2 - 192 \\ 59,2 \: {cm}^{2} \: (c)[/tex]
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[tex]t \: ∆ = \sqrt{ {r}^{2} - ( \frac{1}{2}tb) {}^{2} } = \sqrt{ {20}^{2} - ( \frac{1}{2} .24) {}^{2} } \\ \sqrt{ {20}^{2} - {12}^{2} } = \sqrt{400 - 144} = \sqrt{256} = 16 \\ \\ luas \: tembereng \\ ( \frac{ \alpha }{360} \times \pi \times r \times r) - ( \frac{1}{2} \times a \times t \: ∆) \\ ( \frac{72}{360} \times 3,14 \times 20 \times 20) - ( \frac{1}{2} \times 24 \times 16) \\ 251,2 - 192 \\ 59,2 \: {cm}^{2} \: (c)[/tex]