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Question Number 177634 by aurpeyz last updated on 07/Oct/22

	Answered by HeferH last updated on 07/Oct/22

	$\frac{C D}{A D} = \frac{1}{3}$ $\frac{A_{1}}{A_{t}} = \frac{1}{9} \Rightarrow \frac{42}{A_{t}} = \frac{1}{9}$ $42 \cdot 9 = A_{t} = 378$
	Commented by aurpeyz last updated on 07/Oct/22

	$s o r r y . h o w d i d y o u g e t \frac{1}{9} ?$
	Commented by HeferH last updated on 07/Oct/22

	$W h e n t w o t r i a n g l e s a r e s i m i l a r, t h e r a t i o$ $o f t h e i r a r e a s i s t h e r a t i o o f t h e i r s i d e s$ $s q u a r e d . I n t h i s c a s e {(\frac{1}{3})}^{2} = \frac{1}{9}$
	Commented by aurpeyz last updated on 09/Oct/22

	$t h a n k s$
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