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2x^2 + 2y^2 = 50
x^2 + y^2 = 25
Pusat(0,0)
Jari-jari = akar(25) = 5
b.
4x^2+4y^2 = 36
x^2+y^2 = 9
Pusat(0,0)
Jari-jari = akar(9) = 3