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a right triangle ABC, C is the right angle and CD is the altitude drawn to the hypotenuse. If AD =3 and BD=9 what is AC? show work

Mathematics
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thats as far as i got
you may use geometric mean thingy to solve this or similiar triangles
|dw:1375881597965:dw|

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geometric mean bc im not really good at it
okay ! memorize this :- AC is the geometric mean of AD and AB AC = geometric mean of 3 and 12
|dw:1375881740808:dw|
\[\sqrt{12*3}=\sqrt{36}=6\] like this
yes !
just refreshing on the work we did like a week or so ago
here is the rule :- Each leg of a right triangle is the 'geometric mean' between the hypotenuse(12) and the segment of hypotenuse adjacent to the given leg(3)
lol i was on vacation for 2 weeks. and i remember we doing these back then.. .
yea thx @ganeshie8 :D
np :)

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