A scale drawing of an object is of same shape as the object but at a different size. The ratio o...

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A scale drawing of an object is of same shape as the object but at a different size. The ratio of two corresponding sides in similar figures is called the scale factor.
\[
\text { Scale factor }=\frac{\text { length in image }}{\text { corresponding length in object }}
\]
In the photograph shown below the scale is \( 1: 200 \).
If two similar triangles have a scale factor of \( 6: 5 \), which statement regarding the two triangles is true?
a. The ratio of their perimeters is \( 12: 15 \).
b. Their altitudes have a ratio \( 30: 20 \).
c. Their medians have a ratio \( 18: 15 \).
d. Their angle bisectors have a ratio \( 12: 5 \).
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