{ "name": "Polar Coordinates", "order": 1, "challenges": [ { "id": "59a5801209a6acac5983b573", "title": "Areas and lengths in polar coordinates", "description": [ "" ], "challengeSeed": [ "" ], "tests": [ "" ] }, { "id": "59a5801209a6acac5983a729", "title": "Conic sections in polar coordinates", "description": [ "" ], "challengeSeed": [ "" ], "tests": [ "" ] } ] }