* (8x - 2) - 7x
А
X +8
5
B
-
* +
+ 15x
4
5
C
–4x+
4
D
3
-13x +
2

Step-by-step explanation:

A) Pi value using circumferences

C = circumference

d= diameter

Formula: C = Pi*d⇒Pi = C/d

Circle A)

Pi = 21.98/7 = 3.14

Circle B)

Pi = 18.84/6= 3.14

B) Using areas

A = area

r = radio = diameter/2

Formula: A = Pi*(r^2 )⇒ Pi = A/(r^2)

Circle A

Pi = 38.465/(3.5)^2= 3.14

Circle B

Pi= 28.26/(3^2)= 3.14