What is the area of triangle qrs?
7 square units
9 square units
10 square units
13 square units
the answer is 7 square units

If you are looking for an explanation..

Step-by-step explanation:

It is 7 because if you use the box it out method, you would get 4 triangles and 1 primary one to look for. the other 3 would be 3,2, and 6. Added it would be 11 and subtracted from the rectangles, 18 you would get 7.

For this case we have to find the area through Heron's formula:

Where:

s: It's half the perimeter of the triangle

a, b, c are the sides.

We can find the sides by equating the distance between two points:

We found QR:

We found RS:

So, half of the perimeter is:

Thus, the area is:

Rounding we have that the area is 7 square units

Option A