def circle_equation(center, radius): """Returns (h,k,r) for (x-h)^2 + (y-k)^2 = r^2.""" return (center[0], center[1], radius) </code></pre> <hr> <h3><strong>7. <code>tests/test_geometry_utils.py</code></strong></h3> <pre><code class="language-python">from tools.geometry_utils import distance, slope

line = Line(dot_a.get_center(), dot_b.get_center(), color=YELLOW) ray = Line(dot_a.get_center(), RIGHT * 4, color=GREEN, stroke_width=6) segment = Line(dot_a.get_center(), dot_b.get_center(), color=PURPLE)

## Installation See `installation.md`.

## Exercises 1. Identify collinear sets from an image. 2. Name rays and segments given endpoints. 3. Construct a line through two points using code. </code></pre> <hr> <h3><strong>4. Sample Animation: <code>lessons/01_points_lines/animations/point_construction.py</code></strong></h3> <pre><code class="language-python">from manim import *

```markdown # Lesson 1: Points, Lines, Rays, and Segments