Kelly B. answered • 04/09/21
Patient communication and writing coach for professionals and students
If I understand your question correctly, it is this:
A picture frame has an area of 78 square cm. The width is 22 cm. What is the length?
If this is your question, then this is how you answer it.
22cm * x cm = 78 square cm
x cm = 78 square cm/22 cm
x cm = 3.54 cm is the length
This does not sound like a normal picture frame. So, maybe your question was actually this.
A picture frame has a total perimeter of 78 cm. The width is 22 cm. What is the length?
If this is the question, you solve it like this. Remember you have to double the width and you will be finding double the length, since the perimeter includes 2 widths and 2 lengths on a picture frame.
78 - (22 * 2) = 2 * (length)
78 - 44 = 2 * (length)
34 = 2 * (length)
34/2 = length
17 = length
17 cm is the length
