7
Example 1
This image was taken on September 28th of 2017, this is a polygon that has been founded in a fence in Collpa. Collpa is known as one of the survivors of the Agrarian Reform, this fence was not new, it was old so it is a prove that polygons were use long time ago, around 1937.
1. Real length of one side of the triangle: ?
2. Length of one side in the photo: 13.8 cm
3. Real length of the ruler: 20 cm
4. Length of the ruler in the photo: 13.1 cm
5. Base: 18.2 cm
13.1 = 1
20 = 1.53 scale: 1:1.53 cm
1 cm in the photo - 1.53 cm in real life
13.8 cm in the photo - X
X= 21. 114 cm
Perimeter: 21.114+21.114+18.2= 60.428 cm
Area: 18.2 x 20 = 182 square cm
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