Let blank =x
4+x=3+4
4+x=7
-4 -4
x= 7-4
x=3
blank is 3
1,4
it’s y1-y2
———-
x1-x2
It’s an irrational number (can’t be expressed as a fraction with two integers).
The formula for area of a circle is (pi)*radius^2
Radius is half of diameter so the radius is 2.
2 squared is 4, then multiply by pi to get an answer of 4(pi) or 12.56.