Step-by-step explanation:
since you said we can find the area of the circle by knowing the area of the square
now
area of a square=L^2
100=L^2
√100=√L^2
10=L
the sides are 10cm
area of a circle
πr^2
100=3.14r^2
100/3.14=r^2
31.85=r^2
5.64=r
Answer: A= 10cm
B= 5cm
C= 78.5cm²
