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dolphi86 [110]
2 years ago
13

Find the radius of a circle which has a sector area of 9 pi whose central angle is 90 degrees.

Mathematics
2 answers:
Greeley [361]2 years ago
3 0

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

Svet_ta [14]2 years ago
3 0

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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