The distance formula is derived from the Pythagorean Theorem because the length of one leg of the triangle will always be the difference of the x<span>-coordinates, and the length of the other leg will always be the difference in the </span>y<span>-coordinates</span>
Answer:

Step-by-step explanation:
step 1
Find the radius of the circle
we know that
A circumference of the circle subtends a central angle of 360 degrees
so
using proportion

step 2
Find the area of sector
we know that
The area of the circle subtends a central angle of 360 degrees
so using proportion
Let
x ----> the area of the sector

Means is average. if it says what is the means of that number, that means to find the average. where you add up the number and then divide those numbers by numbers.(13,18,13,14,13,16,14,21,13)then add those numbers and divide by 9 because that's how many numbers there are.