B because first you do the two triangles which =3 then you get the area for the square in the middle which is 15 then you add them up to get 18
The next number in the sequence is 8
Easy
the radius is the distance from the center to a point on the circle
we are given
center=(7,1)
a point=(8,7)
find the distance
distance formula
D=

so the distance between point and center is radius
D=

D=

D=

D=√37 units
radius is √37 units