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05-07-2018
Mathematics

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05-07-2018

The smallest and largest (whole ) triangle are similar so

x / 25 = 4 / x
x^2 = 100
x = 10 answer

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05-07-2018

The triangle ABC and the triangle BDC are similar, therefore:

[tex]\dfrac{21+4}{x}=\dfrac{x}{4}\ \ \ |cross\ multiply\\\\x^2=25\cdot4\\\\x^2=100\to x=\sqrt{100}\\\\\boxed{x=10}[/tex]

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