Calculate the area and circumference of a circle given its radius. Return a Map with keys 'area' and 'circumference'.
Examples:
Input: radius = 5
Output: {'area': 78.54, 'circumference': 31.42}
Explanation: Area = π × r² = 3.14159 × 5² ≈ 78.54, Circumference = 2 × π × r = 2 × 3.14159 × 5 ≈ 31.42
Input: radius = 0
Output: {'area': 0, 'circumference': 0}
Explanation: Both area and circumference are 0 when radius is 0
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