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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