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The height and radius of the cone of which the frustum is a part are \(h_1\) units and \(r_1\) units respectively. Height of the frustum is \(h_2\) units and radius of the smaller base is \(r_2\) units. If \(h_2 : h_1 = 1 : 2\) then \(r_2 : r_1\) is:
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