a photo has a perimeter of 20 cm. using a photocopier you enlarge the photo so that its new perimeter is 70cm. what is the scale factor dilation.

a:12.3
b:7.5
c:3.5
d:0.3
help?

so 3.5?

70:20 = 7/2 = ____

What is 70/20 ?

To find the scale factor dilation, we need to find the ratio of the new perimeter to the original perimeter.

Original perimeter = 20 cm
New perimeter = 70 cm

Scale factor dilation = New perimeter / Original perimeter

Scale factor dilation = 70 cm / 20 cm

Simplifying the ratio, we get:

Scale factor dilation = 3.5

Therefore, the correct answer is c) 3.5.