Question

What is the length of MN

Answer 1

15, because angle L and N are equal, 3x=x+10 so x=5, plugging it in, we get that MN is 15

Answer 2

Answer:

Option A. $MN=15\ units$

Step-by-step explanation:

we know that

An isosceles triangle has two equal sides and two interior equal angles

The triangle LMN is an isosceles triangle

therefore

$ML=MN$

substitute the values

$3x=x+10$

solve for x

$3x-x=10$

$2x=10$

$x=10/2=5\ units$

Find the length of MN

$MN=x+10$ -----> $MN=5+10=15\ units$