From Wikipedia, the free encyclopedia
Sa gheoiméadracht, líne a tharraingítear ionas gurb ionann, má bhíonn na 3 phointe P, Q is R ar an líne, claonadh PQ agus claonadh QR. Sa gheoiméadracht Chairtéiseach, is féidir cothromóid líne dírí a scríobh sa bhfoirm ax + by + c = 0, nó y = - (a/b) x-(c/b) sa chás gur tairisigh iad a, b is c.[1]
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