user: I'm working on a project designing several circular components of different sizes and need the exact areas for circles with radii of 5 units, 10 units, 15 units, and 20 units to estimate the material costs for each component. Could you provide these calculations?

Available functions:
name: geometry_area_circle
description: Calculates the area of a circle.
parameters: type: dict
properties: radius: type: integer
description: The radius of the circle, in feet.
required: radius