Объяснение:
d²=(x1-x2)²+(y1-y2)²
AB=√(xb-xa)²+(yb-ya)²=√(1-(-1))²+(5-1)²=√2²+4²=√4+16=
=√20=2√5
ВС=√(xc-xb)²+(yc-yb)²=√(3-1)²+(1-5)²=
=√2²+(-4)²=√4+16=√20=2√5
AC=√(xa-xc)²+(ya-yc)²=√(-1-3)²+(1-1)²=√(-4)²+0=√16=4
АB=BC=2√5 үшбұрыш АВС Тең бүйірлі
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Объяснение:
d²=(x1-x2)²+(y1-y2)²
AB=√(xb-xa)²+(yb-ya)²=√(1-(-1))²+(5-1)²=√2²+4²=√4+16=
=√20=2√5
ВС=√(xc-xb)²+(yc-yb)²=√(3-1)²+(1-5)²=
=√2²+(-4)²=√4+16=√20=2√5
AC=√(xa-xc)²+(ya-yc)²=√(-1-3)²+(1-1)²=√(-4)²+0=√16=4
АB=BC=2√5 үшбұрыш АВС Тең бүйірлі