Geometry—it's not just for the math classroom! Learners explore the field of forestry through a mathematical lens. An instructional resource explains how forest workers collect data about trees such as height, diameter, and age...

Angles are explained through examples and a video lesson. [0:48]

Rather than dividing a circle into some number of segments (like 360 degrees), mathematicians often prefer to measure angles using the circumference of a unit circle - a circle with radius 1. This way of measuring angles is called...

Explore the structure and measurement of polygons.

Explores how to measure the length of a line segment through examples and a video lesson. [0:40]

Learn how the Law of Cosines uses the measure of angle C to provide an equation that relates the three sides of the triangle with angle C.

Explore and measure a variety of quadrilaterals.

Explores triangles and related vocabulary through examples and a video lesson.