can you help me with this question

Question

ΔABC has side lengths 15 cm, 20 cm, and 25 cm. What could be the side lengths of a triangle similar to ΔABC?

a	7 m, 8 m, and 9 m
b	6 m, 8 m, and 10 m
c	5 cm, 10 cm, and 15 cm
d	30 mm, 40 mm, and 55 mm

Answer 1

The side lengths of similar triangles are proportional. It means that the ratios of corresponding sides are equal.

A)

15cm/700cm = 0.021

20cm/800cm = 0.025

25cm/900cm = 0.027

Ratios are not equal

B)

15cm/600cm = 0.025

20cm/800cm = 0.025

25cm/1000cm = 0.025

All Ratios are equal.

C)

15cm/5cm = 3

20cm/10cm = 2

25cm/15cm = 1.66

Ratios are not equal

D)

15cm/3cm = 5

20cm/4cm = 5

25cm/5.5cm = 4.54

Ratios are not equal.

The side lengths of the similar triangle are 6m, 8m and 10m.

Answer 2

In order to answer this you must see if EVERY side is proportional. I believe the easiest way to do that is to write a proportion and reduce for every set of numbers using the first 3 numbers given each time. So, for the first one you can check by doing 15/7, 20/8, and 25/9 and seeing if they all reduce down to the same fraction (or proportion). Then if they do that's your answer. If they don't, do the same process for the next set of sides.