Answer:
y=-1/2x+2 start at y-intercept 2 and go down by 1 and right by 2
Step-by-step explanation:
Before determining the equation of the circle, we must determine first the radius of the circle and its center point.
Radius of the circle:
We find the distance between points R and S and divide it to 2. To find the distance between two points, the equation is
d = √[(x2 - x1)²+(y2 - y1)²]
d = √[(4 - -2)²+(2 - 2)²]
d = 6
r = 6/2
r = 3
Then, we find the centerpoint by finding the midpoint of both points, since the center of a diameter is the center of the circle. Let centerpoint be (h,k). The formula would be
h = (x1 +x2)/2 = (-2+4)/2 = 1
k = (y1 + y2)/2 = (2+2)/2 = 2
Now that we know all parameters, we substitute this to the standard equation for a circle:
(x - h)² + (y - k)² = r²
(x-1)² + (y - 2)² = 3²
The equation of the circle would be (x-1)² + (y - 2)² = 9
Answer:
1.
The radius is 19
The diameter is given, so it is 38
The circumference is 119.38
2.
The radius is 21
The diameter is 42
The circumference is 131.95
10
x.25<------ 2 decimals
_____
50
+200
______
250<----move the decimal 2 times to the right
the answer is 2.5