Khan Academy Static

Lines_line_segments_and_rays

Let's draw points, lines, line segments, and rays. We'll also think about perpendicular and parallel lines and identify these in two-dimensional figures. Common Core Standard: 4.G.A.1

Geometric_definitions

Consider how precise definitions of geometry terms are like angle, circle, parallel lines, and a few others.

Points_lines_planes

Extending thinking from points and lines (1 and 2 dimensions) to planes (3 dimensions).

Parallel_and_perpendicular

Learn the definitions of "parallel" and "perpendicular".

Measuring_segments

Using a number line, let's learn how we measure segments.

The_golden_ratio

Explore a very famous and useful ratio.