You are right. In circle equation we have =r² so the correct answer will be C od D. But we have to calculate the center of a circle.
Complete the square:
And we have:
So the answer is C (the same left side of equation).
Answer:
y = x
Step-by-step explanation:
slope of y=x+4 is 1
parallel means same slope = 1
so y - 2 = 1*(x - 2)
y = x
Answer:
Step-by-step explanation:
X and y are switched and y times -1 so
reflection across the x=y line (identiy line)
and since the x place it times -1, that is a reflection across y axis
so reflection across x=y line and y axis
Octogon
sides=4
draw lines from the outside angles to the center so they form 8 equal triangle sections
find the area of each triangle and multiply by 8
area of triangle=1/2 base times height
base=4
the height is the distance from the center of one side of the octogon, to the center=5
so area=4 times 1/2 times 5=4 times 5=10
8 triangles so 8 times 10=80
the answer is 80cm^2
the diagram included below shows area for a pentagon
