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-2a= 2
a= -1
-2b= -6
b= 3
a² + b² - r² = -10
(-1)² + 3² -r²= -10
1 + 9 - r² = -10
10 -r²=-10
20 = r²
r= √20
-2a=2÷(-2)
-2b=-6÷(-2)
c=-10
a=-1
b=3
c=-10
a²+b²-r²=c
(-1)²+3²-r²=-10
1+9-r²=-10
-r²=-10-10
-r²=-20×(-1)
r²=√20