Answer:
Step-by-step explanation:
The formula of an area of a circle:
r - radius
The formula of a circumference of a circle:
We have the area of a circle
Substitute to the formula and solve for r:
<em>divide both sides by π</em>
Put the value of r to the formula of a circumference:
Notice that the sequence involves subtracting 10 units from the previous term. Then, we are in the case of an arithmetic sequence with common difference = -10, since we build the next rem by subtracting 10 from the previous. so we have:
term 1 = 42
term 2 = 42 - 10 = 32
term 3 = 32 - 10 = 22
term 4 = 22 - 10 = 12
term 5 = 12 - 10 = 2
term 6 = 2 - 10 = -8
term 7 = -8 - 10 = -18
(h,k) center point
(-6,9) is the center point
h=-6
k=9
radius or r=3
Standard form is (x-h)^2+(y-k)^2=r^2
Equation of the circle is (x+6)^2+(y-9)^2=9
Answer:
The last one
Step-by-step explanation:
<span>você pode colocar isso de forma simples , por favor?</span>