Answer:
C
Step-by-step explanation:
The red bordered area is the patio. We need to find its area.
We will consider
If this was a square, full red square. Then we find the area of the square.
After that, we will subtract the white part that is not there to create the patio shape.
Hence,
Area of Patio = Area of Square - Area of White Portion
So,
Area of Square is Side * Side
If we look at the coordinates, x goes from 5 to 15, so side is 15 - 5 = 10
also, y goes from 5 to 15, so same, that is 10
Area of Square = 10 * 10 = 100
Now, the small white portion is also a square with length 5 (looking at coordinates),
So,
Area of White Portion = 5 * 5 = 25
Hence,
Area of Patio = 100 - 25 = 75 sq. meters
Correct answer is C
