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已知等边△ABC边长为5 cm,将它向下平移8 cm后得△EFG,则△EFG是________三角形,其边长为________cm.
已知等边△ABC边长为5 cm,将它向下平移8 cm后得△EFG,则△EFG的形状是________三角形,其周长为________cm.