Which are undefined terms that can be used to define other terms

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

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What is the volume of a cone with a height of 6 cm in the radius of 2 cm