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-x + y - c = 0
x² + y² = 25
pusat = (0,0)
jari-jari = √25 = 5
r = |-1 . 0 + 1 . 0 - c| / |√((-1)² + 1²)|
5 = |0 + 0 - c| / |√(1 + 1)|
5 = |-c| / |√2|
|-c| = 5√2
c = 5√2 atau c = -5√2
maka nilai c yaitu 5√2 atau -5√2