Respuesta :
Answer: The correct option is (C) 3 cm, 4 cm, 5 cm.
Step-by-step explanation: We are given to select the correct side lengths that could form a triangle.
We know that
the sum of the lengths of any two sides of a triangle is always greater than the third side.
That is, if a, b and c represents the lengths of three sides of a triangle, then we must have
[tex]a+b>c,~~b+c>a,~~c+a>b.[/tex]
Option (A) is
a = 2 cm, b = 2 cm, c = 4 cm.
We have
[tex]a+b=2+2=4=c~~~\Rightarrow a+b=c.[/tex]
Hence, this option is NOT correct.
Option (B) is
a = 3 cm, b = 5 cm, c = 10 cm.
We have
[tex]a+b=3+5=8<10=c~~~\Rightarrow a+b<c.[/tex]
So, this option is NOT correct.
Option (C) is
a = 3 cm, b = 4 cm, c = 5 cm.
We have
[tex]a+b=3+4=7>5=c~~~\Rightarrow a+b>c,\\\\b+c=4+5=9>3=a~~~\Rightarrow b+c>a,\\\\c+a=5+3=8>4=b~~~\Rightarrow c+a>b.[/tex]
So, this option is CORRECT.
Option (D) is
a = 4 cm, b = 8 cm, c = 15 cm.
We have
[tex]a+b=4+8=12<15=c~~~\Rightarrow a+b<c.[/tex]
So, this option is NOT correct.
Thus, (C) is the correct option.
Answer:
Option C.
Step-by-step explanation:
To form a triangle we should always remember that a triangle is possible when sum of two smaller sides of the triangle is greater than the largest side.
If smaller sides are a, b and largest side is c
Then a + b > c
Now we take each option given
Option A) 2 cm, 2 cm, 4 cm
2 + 2 = 4 which equal to the largest side so to form a triangle is not possible.
Option B) 3 cm, 5 cm, 10 cm
3 + 5 = 8 < 10 cm
Here sum of smaller sides is less than to the largest side so triangle will not be formed.
Option C. 3 cm, 4 cm, 5 cm
3 + 4 = 7 > 5 cm
Therefore triangle can be formed.
Option D) 4 cm, 8 cm, 15 cm
4 + 8 = 12 < 15 cm
so triangle can not be formed.
Option C is the correct option.
