+0  
 
+1
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avatar+1709 

How many different isosceles triangles have integer side lengths and perimeter 23?

 

I got 9, the webste says 6 - somebody explain it to meeeeeeeeeeeeeeeeeeeeeeeeeeeeee

 

-\(tommarvoloriddle\)

 Jul 3, 2019
 #1
avatar+110163 
+3

Mmm

x+x+y=23

2x+y=23

 

y<2x    otherwise the ends cannot join up.

 

start with tthe middle

8,8,7

9,9,5

10,10,3

11,11,1

 

7,7,9

6,6,11

 

And that is it.

So that is 6

 Jul 3, 2019
 #2
avatar+1709 
+8

Ohhh... I get it now melody. Thank you!

tommarvoloriddle  Jul 3, 2019
 #3
avatar+110163 
+1

You are welcome.

Melody  Jul 3, 2019

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