anonymous
  • anonymous
Fan & Medal Calculate the length of AD given AB = 7 cm, AC =15 cm, and AE = 20. 3.25 5.25 2.5 5.5 http://static.k12.com/eli/bb/817/-1/0/2_36869_44974/-1/5c45df68fdad740c9f94d22ea5f92dd60c7a03f7/media/da937563f2abb5ff3640096bcfa86f9197313378/mediaasset_651711_1.jpg
Mathematics
chestercat
  • chestercat
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freckles
  • freckles
\[\text{ AB } \cdot \text{ AC }=\text{ AE } \cdot \text{ AD }\]
anonymous
  • anonymous
7x15=20x?
freckles
  • freckles
yep solve for x aka AD

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freckles
  • freckles
wait that one x over on the left hand side is a multiplication sign right?
anonymous
  • anonymous
yes
freckles
  • freckles
\[7 \cdot 15=20x \\ \text{ divide both sides by } 20\]
anonymous
  • anonymous
105/20=5.25
freckles
  • freckles
yes
anonymous
  • anonymous
thanks.
freckles
  • freckles
np that is called the intersecting secant theorem

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