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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?
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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?

User Yocasta
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we can replace EF by 30 and get BC/30=10/3 and therefore BC=30×10 /3=10×10=100
User Robert Johnstone
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