SOLUTION
Given the question in the image, the following are the solution steps to answer the question.
STEP 1: Explain how to prove a square
For a square, the lengths of all the sides are always equal and therefore the distance between the vertices will be the same.
STEP 2: Write the vertices of the figure

STEP 2: Write the distance formula

STEP 3: Find the distance AB

STEP 4: Find the distance BC

STEP 5: Find the distance CD

STEP 6: Find the distance AD

Since,

Therefore, following the side property of a square explained in step 1, the figure given is a SQUARE.
STEP 7: Find the perimeter of the shape
Perimeter is the distance around the shape and is calculated as:

Perimeter = 20
STEP 8: Find the area of the figure
The area of a square is given as:

Area is calculated as:

The area of the shape is 25