The radius is half of the diameter.
9/2=4.5
The radius is 4.5 feet.
Hope this helps!
Circumference of a circle - derivation
This page describes how to derive the formula for the circumference of a circle.
Recall that the definition of pi (π) is the circumference c of any circle divided by its diameter d. Put as an equation, pi is defined as
π
=
c
d
Rearranging this to solve for c we get
c
=
π
d
The diameter of a circle is twice its radius, so substituting 2r for d
c
=
2
π
r
If you know the area
Recall that the area of a circle is given by
area
=
π
r
2
Solving this for r
r
2
=
a
π
So
r
=
√
a
π
The circumference c of a circle is
c
=
2
π
r
The slope intercept form is y=(4/5)x-(6/2)
The answer is D
16.55 divide by 2= 8.275
8.275+8.275+16.55+16.55=49.65
Answer:
106°
Step-by-step explanation:
These angles are alternate interior, therefore they are equal to each other.