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How many isosceles triangles with whole-number length sides have a perimeter of 20 units?

 Aug 2, 2020
 #1
avatar+26626 
+2

I think there are 4       6 6 8   7 7 6   8 8 4   9 9 2

 Aug 2, 2020
 #2
avatar+883 
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Thanks!

qwertyzz  Aug 2, 2020
 #3
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Whole Numbers are all natural numbers plus the zero.

 

5-10-5wink        10-0-10cheeky

 Aug 2, 2020
 #4
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.  There are no 5-10-5 or 10-0-10 triangles!  Those are just 10 unti long lines!

qwertyzz  Aug 2, 2020
 #5
avatar+1042 
+3

Right. Triangles can't have a side length of 0, and 5-10-5 triangles do not satisfy the triangle inequality: https://www.mathsisfun.com/geometry/triangle-inequality-theorem.html

ilorty  Aug 2, 2020

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