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**Hint:**To find the perimeter of the object we will add all the length of all sides of the given figure. If we do not have a particular side then we will find it with the help of the figure. Hence we will get the perimeter that is the length of the border of the figure.

**Complete step-by-step solution:**Now let us see what does perimeter means.

The perimeter is defined on 2-D objects.

Now 2-D objects mean 2-dimensional objects.

A two-dimensional object is an object which has only two measures that is length and width and no thickness.

For example a square, a rectangle.

Now we also have something called 3-D objects.

Objects that we see around us are 3-dimensional objects.

It has length, width as well as thickness.

Now let us see some examples of 3-dimensional objects

cube, sphere, cuboid, pyramid, etc.

Now the perimeter is defined only for 2 Dimensional objects.

Perimeter means the length around the objects. Hence perimeter is nothing but the measure of the border of an object.

For example, let us consider a triangle with each side 5 cm

Now here the perimeter of triangle will be the length of the border

Hence perimeter $= 5 + 5 + 5= 15cm$

Hence perimeter of the square is 15 cm.

Now consider the given figure.

Now we know that perimeter of this figure is $AB + BC + CD + DE + EF + FA.$

From the figure we have $AB = 7, BC = 1, CD = 3, DE = 2.5, EF = 3.$

Now from the figure, we can say that $AF = DE + BC$

Hence $AF = 2.5 + 1 = 3.5.$

Now again consider the perimeter $AB + BC + CD + DE + EF + FA.$

Substituting the values we get perimeter as

$= 7 + 1 + 3 + 2.5 + 3 + 3.5$

$= 14 + 2.5 + 3.5 $

$= 14 + 6 $

$= 20cm$

**Hence the perimeter of the given figure is 20cm.**

**Note:**Now note that the difference between area and perimeter. Perimeter is the total length of the border while the area is a total measure of the object. Now both quantities are measures of 2-dimensional objects. The unit for Area is \[c{{m}^{2}}\] or ${{m}^{2}}$ while the unit of perimeter is cm or m.

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