feat: geometry objects with new structure

src/specklepy/objects/geometry/__init__.py

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+from specklepy.objects.geometry.arc import Arc
+from specklepy.objects.geometry.line import Line
+from specklepy.objects.geometry.mesh import Mesh
+from specklepy.objects.geometry.plane import Plane
+from specklepy.objects.geometry.point import Point
+from specklepy.objects.geometry.polyline import Polyline
+from specklepy.objects.geometry.vector import Vector
+
+# re-export them at the geometry package level
+__all__ = [
+    "Arc",
+    "Line",
+    "Mesh",
+    "Plane",
+    "Point",
+    "Polyline",
+    "Vector"
+]

src/specklepy/objects/geometry/arc.py

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+import math
+from dataclasses import dataclass
+
+from specklepy.objects.base import Base
+from specklepy.objects.geometry.plane import Plane
+from specklepy.objects.geometry.point import Point
+from specklepy.objects.interfaces import ICurve, IHasUnits
+
+
+@dataclass(kw_only=True)
+class Arc(Base, IHasUnits, ICurve, speckle_type="Objects.Geometry.Arc"):
+
+    plane: Plane
+    startPoint: Point
+    midPoint: Point
+    endPoint: Point
+
+    @property
+    def radius(self) -> float:
+        return self.startPoint.distance_to(self.plane.origin)
+
+    @property
+    def measure(self) -> float:
+        start_to_mid = self.startPoint.distance_to(self.midPoint)
+        mid_to_end = self.midPoint.distance_to(self.endPoint)
+        r = self.radius
+        return (2 * math.asin(start_to_mid / (2 * r))) + (2 * math.asin(mid_to_end / (2 * r)))
+
+    @property
+    def length(self) -> float:
+        return self.radius * self.measure

src/specklepy/objects/geometry/line.py

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+from dataclasses import dataclass
+
+from specklepy.objects.base import Base
+from specklepy.objects.geometry.point import Point
+from specklepy.objects.interfaces import ICurve, IHasUnits
+
+
+@dataclass(kw_only=True)
+class Line(Base, IHasUnits, ICurve, speckle_type="Objects.Geometry.Line"):
+    """
+    a line defined by two points in 3D space
+    """
+
+    start: Point
+    end: Point
+
+    @property
+    def length(self) -> float:
+        """
+        calculate the length of the line using Point's distance_to method
+        """
+        return self.start.distance_to(self.end)