Find the radius of a circle which has a sector area of 9 pi whose central angle is 90 degrees.
2 answers:
Answer:360/90 = 4
Total area = 4 times that of the sector.
Step-by-step explanation:
A 90 deg sector has 1/4 the area of the circle.
Total circle area = 4*9pi = 36pi
Answer:
The area is A= 3/2π
Step-by-step explanation:
The area of whole circle is:
A
c
=
π
×
r
2
=
9
π
The central angle
60
o
is
1
6
of a full angle, so the area of the sector is:
A
s
=
1
6
A
c
=
1
6
×
9
π
=
9
6
π
=
3
2
π
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