How big would a garden be for me to keep a goat?

last april i went to my aunt and uncles farm in scotland i loved the baby goats best my aunt said i could keep my favourite bingo he was the only one with floppy ears i said yes my aunt said i would be the perfect care for him my mum said no because our mive garden wouldn't be big enough bingo the goat became sausage meat thanks to my mum.