[tex] Panjang \: DE \\ \sqrt{ {CE}^{2} - {CD}^{2} } = \sqrt{ {15}^{2} - {9}^{2} } \\ \sqrt{225 - 81} = \sqrt{144} = 12 \\ \\ Keliling \: bangun \\ AB + BC + CD + DE + AE \\ 15 + 10 + 9 + 12 + 10 \\ 56 \: cm[/tex]
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[tex] Panjang \: DE \\ \sqrt{ {CE}^{2} - {CD}^{2} } = \sqrt{ {15}^{2} - {9}^{2} } \\ \sqrt{225 - 81} = \sqrt{144} = 12 \\ \\ Keliling \: bangun \\ AB + BC + CD + DE + AE \\ 15 + 10 + 9 + 12 + 10 \\ 56 \: cm[/tex]