Answer:
78.5398
Step-by-step explanation:
Area of a circle:
a=[tex]\pi[/tex]r²
Radius is 10.
a=[tex]\pi[/tex]10²
a=[tex]\pi[/tex]100
a=314.15926
90° is one quarter of the circle, so multiply it by 0.25.
314.15926x0.25=78.5398
I don't know how many places the directions want it rounded to. If it said to use 3.14 for pi, the answer would just be 78.5.
