The circumference of a triangle is 20, and the length of three sides is an integer. How many triangles are there A5 B 6 C8 D10

The circumference of a triangle is 20, and the length of three sides is an integer. How many triangles are there A5 B 6 C8 D10

9,9,2
9,8,3
9,7,4
9,6,5
8,8,4
8,7,5
8,6,6
7,7,6
Selected: C8

Among the triangles whose circumference is 30 and whose sides are not equal to each other and are all integers, how many are not congruent

Turn words into algebraic expressions
Let three sides be a, B, C, then
A ≠ B ≠ C and a, B, C ∈ n
a + b + c = 30
a + b > c |a-b| a |b-c| b |c-a|

How many triangles are there with girth of 20, each side of which is not equal to each other and all are integers

Four
Satisfy the condition a + B + C = 20, a