Standard Library — Math & Statistics

Implement solve(data, mode) using Python's math and statistics modules:

• "circle_area" → data is a radius; return the area of the circle (π × r²).
• "hypotenuse" → data is [a, b]; return the hypotenuse of a right triangle (√(a²+b²)).
• "mean" → return the arithmetic mean of the list data.
• "median" → return the median of the list data.
• "variance" → return the variance of the list data.

Examples

• solve(5, "circle_area") → 78.539...
• solve([3, 4], "hypotenuse") → 5.0
• solve([1, 2, 3, 4, 5], "mean") → 3.0