{
 "id": "25-sketch-triangle",
 "name": "Sketch solver: triangle with lengths and angle",
 "description": "Triangle drawn roughly; l1 horizontal from origin, |l1|=50, |l2|=45, angle(l1,l3)=60 deg. Solved sketch extruded 5 mm.",
 "exercises": [
  "sketch_only",
  "sketch_constraints",
  "angle_dim"
 ],
 "units": {
  "length": "mm",
  "angle": "deg",
  "area": "mm2",
  "volume": "mm3"
 },
 "conventions": {
  "world": "right-handed; Z up. XY/XZ/YZ are the origin planes.",
  "sketch_frame": "sketch-local 2D coords; world = plane.origin + x*plane.x_dir + y*plane.y_dir (origin in mm). Profile 'loops' list sketch entity ids.",
  "point_refs": "'<id>.start' / '<id>.end' / '<id>.center' reuse (share) that existing sketch point; 'at' is its position when referenced.",
  "extrude_direction": "positive = along sketch plane normal unless stated",
  "selections": "selected faces/edges carry 'point': a world-space point on the face / the edge's parametric midpoint; pick the nearest face/edge to it."
 },
 "parameters": [],
 "features": [
  {
   "op": "sketch",
   "name": "Triangle",
   "plane": {
    "ref": "XY",
    "origin": [
     0.0,
     0.0,
     0.0
    ],
    "x_dir": [
     1.0,
     0.0,
     0.0
    ],
    "y_dir": [
     0.0,
     1.0,
     0.0
    ],
    "normal": [
     0.0,
     0.0,
     1.0
    ]
   },
   "entities": [
    {
     "type": "line",
     "start": {
      "at": [
       2,
       1
      ]
     },
     "end": {
      "at": [
       45,
       3
      ]
     },
     "id": "l1"
    },
    {
     "type": "line",
     "start": {
      "ref": "l1.end",
      "at": [
       45.0,
       3.0
      ]
     },
     "end": {
      "at": [
       22,
       35
      ]
     },
     "id": "l2"
    },
    {
     "type": "line",
     "start": {
      "ref": "l2.end",
      "at": [
       22.0,
       35.0
      ]
     },
     "end": {
      "ref": "l1.start",
      "at": [
       2.0,
       1.0
      ]
     },
     "id": "l3"
    }
   ],
   "constraints": [
    {
     "type": "coincident",
     "refs": [
      "l1.start",
      "origin"
     ]
    },
    {
     "type": "horizontal",
     "refs": [
      "l1"
     ]
    }
   ],
   "dimensions": [
    {
     "type": "distance",
     "refs": [
      "l1.start",
      "l1.end"
     ],
     "value": 50,
     "unit": "mm",
     "orientation": "aligned"
    },
    {
     "type": "distance",
     "refs": [
      "l2.start",
      "l2.end"
     ],
     "value": 45,
     "unit": "mm",
     "orientation": "aligned"
    },
    {
     "type": "angle",
     "refs": [
      "l1",
      "l3"
     ],
     "value": 60,
     "unit": "deg",
     "text_at": [
      8,
      4
     ]
    }
   ]
  },
  {
   "op": "extrude",
   "name": "Extrude1",
   "operation": "new",
   "profiles": [
    {
     "sketch": "Triangle",
     "loops": [
      {
       "outer": true,
       "curves": [
        "l1",
        "l2",
        "l3"
       ]
      }
     ]
    }
   ],
   "extent": {
    "type": "distance",
    "distance": 5,
    "direction": "positive"
   },
   "result_bodies": [
    "Triangle"
   ]
  }
 ]
}