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Elena L [17]
4 years ago
12

Geometry Problem (PIC)

Mathematics
1 answer:
ryzh [129]4 years ago
4 0
Look at the picture.


\Delta ADC\ and\ \Delta CDB\ are\ similar\ therefore\\\\\dfrac{y}{4}=\dfrac{9}{y}\ \ \ \ |cross\ multiply\\\\y\cdot y=4\cdot9\\\\y^2=36\to y=\sqrt{36}\to y=6

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