Triangle ABC is similar to triangle DEF and has a ratio of similarity of 10:3. If side EF measures 30 mm, how long is side BC?

Question

anonymous · Answer

Please, please, please, please,pleaseee help :)

anonymous · Answer

without a picture i will assume that the labelling is in alphabetical order
so $\frac{BC}{EF}=\frac{10}{3}$

anonymous · Answer

Yes, sorry. There wasn't any picture. ):

anonymous · Answer

we can replace $EF$ by $30$ and get 
$$\frac{BC}{30}=\frac{10}{3}$$ and therefore 
$$BC=\frac{30\times 10}{3}=10\times 10=100$$

anonymous · Answer

Oh, okayy. :D So the answer is 100mm?

anonymous · Answer

yup

anonymous · Answer

Thank youu! Could you help me with one more thing?

anonymous · Answer

sure

anonymous · Answer

Nvmind. I understand this one. Thank you so much, really♥

anonymous · Answer

yw