Repository: ManimCommunity/manim
File: manim/mobject/geometry/line.py (Python)

Code before:
        A: np.array(), B: np.array(), C: np.array(), **kwargs
    ) -> Angle:
        """Create an instance of the :class:`Angle` class from three points.

        Parameters
        ----------
        A
            :class:Numpy.array()  -  End point of line 1
        B
            :class:Numpy.array()  -  Start point of lines 1 and 2
        C
            :class:Numpy.array()  -  End point of line 2
        **kwargs
            keyword arguments are passed to Angle constructor

        Returns
        -------
        : The Angle calculated from the three points

        Examples
        --------
        ::
            >>> A = np.array(UP)
            >>> B = np.array(ORIGIN)
            >>> C = np.array(RIGHT)
            >>> ang = Angle.from_three_points(A, B, C)
        """
        return Angle(Line(B, A), Line(B, C), **kwargs)


class RightAngle(Angle):
    """An elbow-type mobject representing a right angle between two lines.

    Parameters
    ----------
    line1
        The first line.
    line2
        The second line.
    length
        The length of the arms.
    **kwargs
        Further keyword arguments that are passed to the constructor of :class:`Angle`.

    Examples
    --------
    .. manim:: RightAngleExample
        :save_last_frame:

        class RightAngleExample(Scene):
            def construct(self):

Review comment (suggestion):
I actually think it would be nice to include a (static image) example; you can do that with the `.. manim` directive too, just specify `:save_last_frame:` as an option; check other source files for the exact syntax.

Code after:
        A: np.ndarray, B: np.ndarray, C: np.ndarray, **kwargs
    ) -> Angle:
        """The angle between the lines AB and BC.

        This constructs the angle :math:`\angle ABC`.

        Parameters
        ----------
        A
            The endpoint of the first angle leg
        B
            The vertex of the angle
        C
            The endpoint of the second angle leg

        **kwargs
            Further keyword arguments are passed to :class:`.Angle`

        Returns
        -------
        The Angle calculated from the three points

                    Angle(line1, line2, radius=0.5, quadrant=(-1,1), stroke_width=8),
                    Angle(line1, line2, radius=0.7, quadrant=(-1,-1), color=RED, other_angle=True),

        Examples
        --------
        .. manim:: AngleFromThreePointsExample
            :save_last_frame:

            class AngleFromThreePointsExample(Scene):
                def construct(self):
                    sample_angle = Angle.from_three_points(UP, ORIGIN, LEFT)
                    red_angle = Angle.from_three_points(LEFT + UP, ORIGIN, RIGHT, radius=.8, quadrant=(-1,-1), color=RED, stroke_width=8, other_angle=True)
                    self.add(red_angle, sample_angle)
        """
        return Angle(Line(B, A), Line(B, C), **kwargs)


class RightAngle(Angle):
    """An elbow-type mobject representing a right angle between two lines.

    Parameters
    ----------
    line1
        The first line.
    line2
        The second line.
    length
        The length of the arms.
    **kwargs