Two triangles can be similar if their corresponding angels are congruent also the corresponding sides are in proportion triangles can be the same shape but not really same size
LCM stands for Least Common Multiple.
The LCM of two numbers is the lowest number that can divide into the two original numbers.
For most numbers, you can find the LCM by simply multiplying the two numbers:

The LCM of 7 and 13 will be 91.
The height of the model in inches would be 6. if you multiply 30 until it reaches 180 you will have 6.