Answer:
r = 8 cm
Step-by-step explanation:
Circumference of circle = 50.24 cm
2πr = 50.24
2 * 3.14 * r = 50.24

r = 8 cm
Answer:

Step-by-step explanation:
The n th term of a geometric sequence is
= a 
where a is the first term and r the common ratio, hence
= 4 ×
= 4 ×
= 
Since all sides of a square are the same you can square the side length you are given.
A = (8.2)x(8.2) or 8.2^2
That would give you 67.24