Question

Which of the following could be the lengths of three sides of a triangle

A.1,2,3
B.3,3,7
C.4,8,12
D.5,7,9​

Answer 1

Answer: D.5,7,9

Explanation:

Rules is that:

a+b>c

a+c>b

b+c>a

let a = 5

let b = 7

let c = 9

5+7>9

5+9>7

7+9>5

Therefore, this satisfies the rules of a triangle