This very basic website gives a clear, simple explanation of what an acute angle is.

This math tutorial provides an illustrated explanation of a reflex angle.

Sharpen your logic, time, and angle recognition skills while working on this challenge. The solution is available to double check your results. (Hint: Use the "90 degree" right angle button on the clock to check if something is a right...

The CyberSquad has to deal with angles and distances to locate a treasure chest in this video segment from Cyberchase.

[Free Registration/Login may be required to access all resource tools.] Students watch a video overview and attempt practice problems on classifying triangles based on the number of equal sides.

Differences between shapes are determined through measurement skills.

If you think you can handle the Pythagorean Theorem, then this is a math challenge you should try. Explore geometric relationships and measurement in this one page activity from the NCTM Math Challenges for Families series.

Third graders will use the bat houses we built as examples of various quadrilaterals.

Half-length practice test for the third grade OAT (Ohio Achievement Test). The test includes 15 multiple-choice and 5 open-response question dealing with topics such as measurement (time, angles, ruler), data analysis (bar graphs,...

Test your mathematical aptitude with challenge exploring the concepts of measurement and geometry. Find the area of the windshield wipers to figure out who sees better in the rain, car drivers or truck drivers. An activity from the NCTM...

[Free Registration/Login Required] This lesson lets students identify, draw, and measure parts of a circle. The lesson compliments 5th grade Harcourt Math, Lesson 23.4. Activote assessment is included at the end of the lesson.