Curated OER
Mr. Bo Jangle, What's Your Angle?
Third graders explore angles. In this geometry lesson, 3rd graders identify and define acute, obtuse, and right angles. Students form angles with their bodies, find angles in picture books, and record angles found outside in their math...
Curated OER
Measuring the Earth
Students use principles of geometry to measure the circumference of the Earth. In this applied geometry lesson, students use mathematics to determine scientific information. They make measurements, calculate the central angle, and...
Curated OER
Why do Stars Rise in the East?
In this stars rise in the east learning exercise, students use geometry to show how the Earth rotates from west to east and why celestial bodies appear to rise in the east and set in the west. Students draw a figure and label given...
Curated OER
Measuring The Earth
Students use their geometry and trigonometry skills to determine the distance between their school and another school.
CK-12 Foundation
Ck 12: Plix: Vision and the Eye: The Line Up
[Free Registration/Login Required] Are your eyes playing tricks on you? This site contains parallel and skew lines that creates an optical illusion.