Предмет: Геометрия, автор: vikapronina76

Сфера задана уравнением х^+у^+ z^=8z+20 найти радиус

Ответы

Автор ответа: genius20
1

x^2+y^2+z^2=8z+20\\x^2+y^2+z^2-8z+16=20+16\\x^2+y^2+(z-4)^2=36\\x^2+y^2+(z-4)^2=6^2

Ответ: 6 ед.

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