Determining parallel lines using the proportionality theorem of parallel lines

The video tutorial explains the triangle proportionality theorem, focusing on setting up and simplifying proportions to prove parallel lines. It involves calculating segment lengths and using ratios to demonstrate the theorem's application in geometry.

How do you determine if two lines are parallel using the triangle proportionality theorem?

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What is the triangle proportionality theorem used to prove?

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If AE is 30 and EC is 15, what is the relationship between AD and DB?

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Explain how you can use cross multiplication to verify the ratios in the triangle proportionality theorem.

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What is the simplified ratio when comparing DB and double DB?

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