Question

The length of two sides of a triangle are $20$ mm and $29$ mm. Which of the following can be the value of third side to form the triangle?

• A. $6$ mm
• B. $7$ mm
• C. $23$ mm
• D. $8$ mm

Answer 1

The correct option is C $23$ mm

We know that $(29-20)$ mm should smaller than the third side.

Thus, the third side is greater than $9$ mm.

Also, third side should be less than sum of $20$ and $29$ mm i.e. $49$ mm.
Thus, $23$ mm can be the length of third side to form a triangle.