We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
+1
222
2
avatar

 

Thank you so much

 Apr 2, 2018
 #1
avatar+4296 
+1

Is it 3? Bottom base: 4+9=13, right-angled triangle, so z=12, x=5. If we know one side is 5, and the other side is 4, y=3..

 Apr 2, 2018
 #2
avatar+101788 
+1

Let's look at this one closely......

 

Here's a pic :

 

 

We have  altitude  BC  drawn to a right angle in  triangle ABD

Note that triangle ABC  is similar to triangle CBD

 

Thus

 

AB / BC  = CB / BD     which implies that

 

4 / BC  = BC / 9        cross-multiply

 

36  = BC^2       take the square root of both sides

 

6  = BC  = "y"

 

Thus,  altitide BC in  this situation serves as a geometric mean to the two bases of each of the smaller triangles formed

 

 

 

 

cool cool cool

 Apr 2, 2018

12 Online Users

avatar
avatar