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Prove que, se dois círculos se intersectam em exatamente um ponto, então, eles são tangentes.
Considere dois círculos de raios r1 e r2. Mostre que, se eles intersectam em mais de um ponto, então, r1 + r2 é maior do que a distancia entre seus centros.
Um circulo está inscrito em um triangulo equilátero. Determine o raio do circulo sabendo que a altura do triangulo é 6 cm
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