If two similar triangles have a scale fa...

If two similar triangles have a scale factor of `a: b`. Which statement regarding the two triangles is true?
(i)The ratio of their perimeters is `3a : b`
(ii)Their altitudes have a ratio `a:b`
(iii)Their medians have a ratio `(a)/(2):b`
(iv)Their angle bisectors have a ratio `a^(2):b^(2)`

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