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In figure, DE||BC and the ratio of the a...

In figure, DE||BC and the ratio of the areas of `triangleADE`and trapezium BDEC is 4:5 . Find the ratio of DE:BC . If BD = 2cm. Then find AD.

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To solve the problem step by step, we will follow the reasoning provided in the video transcript and break it down into clear steps. ### Step 1: Understand the Given Information We are given that DE is parallel to BC and the ratio of the areas of triangle ADE and trapezium BDEC is 4:5. We also know that BD = 2 cm. We need to find the ratio of DE to BC and the length of AD. ### Step 2: Use the Area Ratio Let the area of triangle ADE be \( A_{ADE} \) and the area of trapezium BDEC be \( A_{BDEC} \). According to the problem: \[ ...
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