The region bounded by radii 
and 
and arc 
is known as a secant of the circle.
Definitions:
Price Discrimination
The practice of selling the same product to different buyers at different prices based on willingness to pay, not differences in cost.
Identical Goods
Products that are indistinguishable from each other in terms of quality, function, and characteristics.
Production Costs
The total expense incurred in manufacturing a product or providing a service, including raw materials, labor, and overhead expenses.
Monopolistic Competition
An industry that has many firms producing a differentiated product.
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