You look at a button under a magnifying glass. Find the actual length of the button.
The image of the button is 4 times the button's actual size and has a diameter of 14 cm.
To find the actual length of the button, we need to divide the diameter of the image by 4 (since the image is 4 times the actual size).
Actual diameter = 14 cm / 4 = 3.5 cm
So, the actual length of the button is 3.5 cm.