@@ -1968,6 +1968,9 @@ def __init__(self, xy, width, height, angle=0.0,
 
         self.theta1 = theta1
         self.theta2 = theta2
+        self._theta1, self._theta2, self._width, self._height = \
+            self._theta_stretch()
+        self._path = Path.arc(self._theta1, self._theta2)
 
     @artist.allow_rasterization
     def draw(self, renderer):
@@ -2023,36 +2026,7 @@ def draw(self, renderer):
 
         self._recompute_transform()
 
-        width = self.convert_xunits(self.width)
-        height = self.convert_yunits(self.height)
-
-        # If the width and height of ellipse are not equal, take into account
-        # stretching when calculating angles to draw between
-        def theta_stretch(theta, scale):
-            theta = np.deg2rad(theta)
-            x = np.cos(theta)
-            y = np.sin(theta)
-            stheta = np.rad2deg(np.arctan2(scale * y, x))
-            # arctan2 has the range [-pi, pi], we expect [0, 2*pi]
-            return (stheta + 360) % 360
-
-        theta1 = self.theta1
-        theta2 = self.theta2
-
-        if (
-            # if we need to stretch the angles because we are distorted
-            width != height
-            # and we are not doing a full circle.
-            #
-            # 0 and 360 do not exactly round-trip through the angle
-            # stretching (due to both float precision limitations and
-            # the difference between the range of arctan2 [-pi, pi] and
-            # this method [0, 360]) so avoid doing it if we don't have to.
-            and not (theta1 != theta2 and theta1 % 360 == theta2 % 360)
-        ):
-            theta1 = theta_stretch(self.theta1, width / height)
-            theta2 = theta_stretch(self.theta2, width / height)
-
+        self._update_path()
         # Get width and height in pixels we need to use
         # `self.get_data_transform` rather than `self.get_transform`
         # because we want the transform from dataspace to the
@@ -2061,12 +2035,12 @@ def theta_stretch(theta, scale):
         # `self.get_transform()` goes from an idealized unit-radius
         # space to screen space).
         data_to_screen_trans = self.get_data_transform()
-        pwidth, pheight = (data_to_screen_trans.transform((width, height)) -
-                           data_to_screen_trans.transform((0, 0)))
+        pwidth, pheight = (
+            data_to_screen_trans.transform((self._width, self._height)) -
+            data_to_screen_trans.transform((0, 0)))
         inv_error = (1.0 / 1.89818e-6) * 0.5
 
         if pwidth < inv_error and pheight < inv_error:
-            self._path = Path.arc(theta1, theta2)
             return Patch.draw(self, renderer)
 
         def line_circle_intersect(x0, y0, x1, y1):
@@ -2118,10 +2092,11 @@ def segment_circle_intersect(x0, y0, x1, y1):
             # arctan2 return [-pi, pi), the rest of our angles are in
             # [0, 360], adjust as needed.
             theta = (np.rad2deg(np.arctan2(y, x)) + 360) % 360
-            thetas.update(theta[(theta1 < theta) & (theta < theta2)])
-        thetas = sorted(thetas) + [theta2]
-        last_theta = theta1
-        theta1_rad = np.deg2rad(theta1)
+            thetas.update(
+                theta[(self._theta1 < theta) & (theta < self._theta2)])
+        thetas = sorted(thetas) + [self._theta2]
+        last_theta = self._theta1
+        theta1_rad = np.deg2rad(self._theta1)
         inside = box_path.contains_point(
             (np.cos(theta1_rad), np.sin(theta1_rad))
         )
@@ -2140,6 +2115,44 @@ def segment_circle_intersect(x0, y0, x1, y1):
         # restore original path
         self._path = path_original
 
+    def _update_path(self):
+        # Compute new values and update and set new _path if changed
+        stretched = self._theta_stretch()
+        if any(a != b for a, b in zip(stretched, (self._theta1, self._theta2,
+                                                  self._width, self._height))):
+            self._theta1, self._theta2, self._width, self._height = stretched
+            self._path = Path.arc(self._theta1, self._theta2)
+
+    def _theta_stretch(self):
+        # If the width and height of ellipse are not equal, take into account
+        # stretching when calculating angles to draw between
+        def theta_stretch(theta, scale):
+            theta = np.deg2rad(theta)
+            x = np.cos(theta)
+            y = np.sin(theta)
+            stheta = np.rad2deg(np.arctan2(scale * y, x))
+            # arctan2 has the range [-pi, pi], we expect [0, 2*pi]
+            return (stheta + 360) % 360
+
+        width = self.convert_xunits(self.width)
+        height = self.convert_yunits(self.height)
+        if (
+            # if we need to stretch the angles because we are distorted
+            width != height
+            # and we are not doing a full circle.
+            #
+            # 0 and 360 do not exactly round-trip through the angle
+            # stretching (due to both float precision limitations and
+            # the difference between the range of arctan2 [-pi, pi] and
+            # this method [0, 360]) so avoid doing it if we don't have to.
+            and not (self.theta1 != self.theta2 and
+                     self.theta1 % 360 == self.theta2 % 360)
+        ):
+            theta1 = theta_stretch(self.theta1, width / height)
+            theta2 = theta_stretch(self.theta2, width / height)
+            return theta1, theta2, width, height
+        return self.theta1, self.theta2, width, height
+
 
 def bbox_artist(artist, renderer, props=None, fill=True):
     """
 
@@ -7,7 +7,7 @@
 
 import matplotlib as mpl
 from matplotlib.patches import (Annulus, Ellipse, Patch, Polygon, Rectangle,
-                                FancyArrowPatch, FancyArrow, BoxStyle)
+                                FancyArrowPatch, FancyArrow, BoxStyle, Arc)
 from matplotlib.testing.decorators import image_comparison, check_figures_equal
 from matplotlib.transforms import Bbox
 import matplotlib.pyplot as plt
@@ -642,7 +642,7 @@ def test_large_arc():
     y = -2115
     diameter = 4261
     for ax in [ax1, ax2]:
-        a = mpatches.Arc((x, y), diameter, diameter, lw=2, color='k')
+        a = Arc((x, y), diameter, diameter, lw=2, color='k')
         ax.add_patch(a)
         ax.set_axis_off()
         ax.set_aspect('equal')
@@ -669,7 +669,7 @@ def test_rotated_arcs():
         for prescale, centers in zip((1 - .0001, (1 - .0001) / np.sqrt(2)),
                                       (on_axis_centers, diag_centers)):
             for j, (x_sign, y_sign) in enumerate(centers, start=k):
-                a = mpatches.Arc(
+                a = Arc(
                     (x_sign * scale * prescale,
                      y_sign * scale * prescale),
                     scale * sx,
@@ -808,3 +808,32 @@ def test_default_capstyle():
 def test_default_joinstyle():
     patch = Patch()
     assert patch.get_joinstyle() == 'miter'
+
+
+@image_comparison(["autoscale_arc"], extensions=['png', 'svg'],
+                  style="mpl20")
+def test_autoscale_arc():
+    fig, axs = plt.subplots(1, 3, squeeze=False, figsize=(4, 1))
+    arc_lists = (
+        [Arc((0, 0), 1, 1, theta1=0, theta2=90)],
+        [Arc((0.5, 0.5), 1.5, 0.5, theta1=10, theta2=20)],
+        [Arc((0.5, 0.5), 1.5, 0.5, theta1=10, theta2=20),
+         Arc((0.5, 0.5), 2.5, 0.5, theta1=110, theta2=120),
+         Arc((0.5, 0.5), 3.5, 0.5, theta1=210, theta2=220),
+         Arc((0.5, 0.5), 4.5, 0.5, theta1=310, theta2=320)])
+
+    for ax, arcs in zip(axs[0], arc_lists):
+        for arc in arcs:
+            ax.add_patch(arc)
+        ax.autoscale()
+        ax.set_axis_off()
+
+
+@check_figures_equal(extensions=["png", 'svg', 'pdf', 'eps'])
+def test_arc_in_collection(fig_test, fig_ref):
+    arc1 = Arc([.5, .5], .5, 1, theta1=0, theta2=60, angle=20)
+    arc2 = Arc([.5, .5], .5, 1, theta1=0, theta2=60, angle=20)
+    col = mcollections.PatchCollection(patches=[arc2], facecolors='none',
+                                       edgecolors='k')
+    fig_ref.subplots().add_patch(arc1)
+    fig_test.subplots().add_collection(col)
@@ -7,7 +7,7 @@
 import matplotlib as mpl
 from matplotlib.backend_bases import MouseButton
 from matplotlib import cm
-from matplotlib import colors as mcolors
+from matplotlib import colors as mcolors, patches as mpatch
 from matplotlib.testing.decorators import image_comparison, check_figures_equal
 from matplotlib.testing.widgets import mock_event
 from matplotlib.collections import LineCollection, PolyCollection
@@ -1742,3 +1742,14 @@ def test_view_init_vertical_axis(
         tickdir_expected = tickdirs_expected[i]
         tickdir_actual = axis._get_tickdir()
         np.testing.assert_array_equal(tickdir_expected, tickdir_actual)
+
+
+@image_comparison(baseline_images=['arc_pathpatch.png'],
+                  remove_text=True,
+                  style='default')
+def test_arc_pathpatch():
+    ax = plt.subplot(1, 1, 1, projection="3d")
+    a = mpatch.Arc((0.5, 0.5), width=0.5, height=0.9,
+                   angle=20, theta1=10, theta2=130)
+    ax.add_patch(a)
+    art3d.pathpatch_2d_to_3d(a, z=0, zdir='z')