Question

find the missing side length. assume that all intersecting sides meet at right angles. include the correct unit in your answer.

Explanation:

Step1: Analyze horizontal side - lengths

The sum of the horizontal side - lengths on the right side of the figure should equal the missing horizontal side - length. The two horizontal side - lengths on the right are 7 cm and 5 cm.

Step2: Calculate the missing side - length

We add the two known horizontal side - lengths: $7 + 5=12$ cm.

Answer:

12 cm