Answer:
13 mm
Step-by-step explanation:
Given that scale from actual coin to the photo is
8 mm to 2 cm.
Distance across the coin in photo is 3.25 cm.
To find:
Distance across the actual coin = ?
Solution:
First of all, let us learn about scaling concept.
The concept of scaling is used to represent the actual object as as image so that it can be drawn on a paper.
This scaling can result in a smaller image or a bigger image depending upon the size of object.
Here, 8 mm coin is represented as 2 cm coin on the photo.
Let us use unitary method to identify the distance across actual coin to the distance across photo.
2 cm ---- 8 mm
1 cm ------ [tex]\frac{8}{2} = 4\ mm[/tex]
3.25 cm ------- 4 \times 3.25 mm = 13 mm
