How do I fix this error • Write/define a function [B]area_circle[/B] that [U]takes in the radius[/U] to calculate and return the [U]area of a circle[/U]. [I](Note: You can take pi to be 3.142)[/I] • Write/define a function [B]area_triangle[/B] that takes in the [U]base and height[/U] to calculate and return the [U]area of a triangle[/U]. [I](Note: Area of triangle = (base * height) /2)[/I] • Use the above functions to [B]calculate[/B] the total area of the shaded region in the figure below and [B]print[/B] the result.