A= pi×r^2 r=(1/2)d
A=pi×(1/2)d×(1/2)d
A=pi×0.5d×0.5d
A=pi×(0.5)^2 × d^2
A=pi×0.25d^2
Yes, it is true. Divide them and you get 12/30=.4 and 20/50=.4.
Answer:

Step-by-step explanation:

The area of the shaded region is 85 units cubed.
Answer:
C
Step-by-step explanation:
The common ratio r of a geometric sequence is
r =
=
=
×
=
→ C