If the lengths of the two sides of the triangle are 3 and 7 respectively, the value range of the third side length C is 0___ When the perimeter is odd, the third edge is______ When the perimeter is a multiple of 5, the third side length is________ .

If the lengths of the two sides of the triangle are 3 and 7 respectively, the value range of the third side length C is 0___ When the perimeter is odd, the third edge is______ When the perimeter is a multiple of 5, the third side length is________ .

If the lengths of the two sides of the triangle are 3 and 7 respectively, the value range of the third side length C is 0_ (4,10)__ When the perimeter is odd, the third edge is__ 5 or 7 or 9____ When the perimeter is a multiple of 5, the third side length is__ 5______ .

In a known triangle, if the lengths of two sides are 4 and 5, and the perimeter of the triangle is odd, then the length of the third side is_____________
In the triangle ABC, ab = AC, D is a point on AC. prove that AC is greater than 2-1 (BD + CD)

5-4

Isosceles 3, triangle side length 3, 5, perimeter 11 and 13, side length 3 and 6, perimeter 15, what are the above rules?

When taking the short side as the waist, the long side must be less than 2 times of the short side, otherwise it cannot be a triangle
That is: if the short side is twice larger than the long side with two girths, the result is 2 * short side + long side, 2 * long side + short side
If 2 times of the short side is less than or equal to the long side, there is only one result of perimeter 2 * long side + short side
Do you understand?