In the polar coordinate system, a circle centered at the origin with a radius  has equation .

Dead center has a diameter of .

radius of dead center is .

The polar equation of dead center is .

The equations of the and radius circles are and respectively.

(b)

For draw a circle centered at the origin with radius .

For , draw a circle centered at the origin with radius .

For , draw a circle centered at the origin with radius .

(a)

The polar equation of dead center is .

The equations of the and radius circles are and respectively.

(b)

For draw a circle centered at the origin with radius .

For , draw a circle centered at the origin with radius .

For , draw a circle centered at the origin with radius .

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