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प्रश्न
In ∆ABC, B – D – C and BD = 7, BC = 20, then find the following ratio.
`(A(∆ABD))/(A(∆ABC))`
उत्तर
Draw a perpendicular from vertex A to line BC.
`(A(∆ABD))/(A(∆ABC)) = ((1/2) xx AX xx BD)/((1/2) xx AX xx BC)`
= `(BD)/(BC)`
= `7/20`
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