Write the standard equation for the circle with the given radius and center.
Center (-9, -4), radius 
Definitions:
Bolus
A tiny ball-shaped lump of material, particularly of food chewed right before it's swallowed.
Esophagus
The muscular tube that connects the throat (pharynx) with the stomach, conveying food and liquids.
Digestive System
An assembly of organs that collaborate to transform food into energy and essential nutrients to nourish the whole body.
Sigmoid Colon
The part of the large intestine closest to the rectum and anus, shaped like an "S".
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