Respuesta :

Answer:

B. 12cm,7cm,5cm

Step-by-step explanation:

use triangular inequality therom

A+B>C  12+7>5 true

B+C>A 7+5>12 false

A+C>B 12+5>7 true

One of the sides is not complete so it can not be a triangle.

Answer is option-B

Triangle Inequality Theorem :

In Euclidean geometry, theorem that the sum of any two sides of a triangle is greater than the third side; in symbols,

a + b > c.

a + c  > b

b + c  > a

(Here)

For option-B  

let's take a = 12cm, b = 7cm and c = 5cm.

b + c = a.

It violates triangle Inequality property.

Learn more about Triangle Inequality theorem here: https://brainly.com/question/1163433?referrer=searchResults

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