Question

What is the length of CD? In this diagram, AABC ~ AEDC. 20-% c * 7 21​

Answer 1

Answer:

$\frac{BC}{DC}=\frac{AC}{EC}$

$\frac{20-x}{x} =\frac{21}{7}$

$\frac{20-x}{x} =3$

$20-x=3x$

$4x=20$

$x=5$

$So, CD=5$

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