Step-by-step explanation:
R= 2,045.1071428571 espero sea lo que necesitas :)
Answer:
(a) 
(b) 
Step-by-step explanation:
(a) Write and simplify an expression for the exact area of the sidewalk.
(b) Find the approximate area of the sidewalk. Use 3.14 to approximate .
(a) The sidewalk area is the difference in the area of outer circle and inner circle.
Use formula
for the area of the circle:

The difference is

(b) Use approximation
then

Answer:

Step by step explanation:









I don't know which form you want but here
Exact form: 5/4
decimal form is: 1.25
mixed number form:
1 1/4
Answer:

Step-by-step explanation:
we know that
The measure of central angle ABC is
radians
so

subtends the complete circle
The area of the shaded sector is the area of a quarter circle
so
The area of a quarter circle is equal to

we have

substitute
