Answer:
28.26
Step-by-step explanation:
For this, we can simply use the pi times r squared because we have the radius.
simplify pi to 3.14, so we can do 3.14 times 3 squared.
we get 9x 3.14, which is 28.26.
Take a picture of the problem and then ask your question
The diameter of a circle by definition goes from one "side" of the circle to the other "side" and goes through the center. If we are given the coordinates of the endpoints of the diameter, we need to find the midpoint of that segment to find the center of the circle. The midpoint formula is as follows

. Filling in accordingly, we have

. Doing the math on that gives us a midpoint of (-7, -6), which is also the center of the circle.
Answer:
81.20
Step-by-step explanation:
I took the test and got it right
The simplified expression would be 3s + 15.
In order to find this we need to write an equation for the longest side. Since it's 3 more than twice as much as the smallest side (s), we can express it as 2s + 3. Now we simply add all 3 together and simplify.
2s + 3 + 12 + s -----> simplify
3s + 15