Learn about the angle measure of an arc with this handy reference tool. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.

A comprehensive guide for learning all about angles with definitions, examples, and practice questions.

This study guide on angles covers key vocabulary, ways to name angles, how to measure them, the Protractor Postulate and the Angle Addition Postulate, types of angles, congruent angles, angle bisectors, and angle pairs. It is available...

In this interactive website, students practice various math skills such as identifying different types of angles, use the degree symbol, estimate and measure angles, and construct angles.

In this instructional activity, students learn about four types of angles: adjacent, vertical, supplementary, and complementary. They explore the relationships between these types of angles by folding paper, measuring angles with a...

Third graders are preparing to build bat houses. They have calculated surface area, identified nail placement, and will now collect data on angle types in this real-world activity.

In this task, 8th graders have to reason with angles and angle measurements, including the sum of the angles in a triangle, to deduce information from a picture. Includes a GeoGebra worksheet that the teacher can use for demonstration...

Determine which angle has a greater measure by looking at the size of the opening between the angle's rays.

In this task, 8th graders are presented with a drawing of two parallel lines connected through two line segments. They are given the measures of two angles and are asked to find a third. Aligns with 8.G.A.5.

The Geometry tutorial discusses interior and exterior angles of a polygon. Sample exercises with explanations are included.

Given two sides in a right triangle, find one of the acute angles using trigonometry.

[Free Registration/Login may be required to access all resource tools.] Looks at triangle problems where you are given the area and must use trigonometry to find unknown sides or angles.

Students solve for missing angle measures by applying what they have learned about types of angles and the angle measures of polygons. Students do a pre-assessment at the end of the lesson.

Prosthetic limbs and artificial joints can help people with disease or injury lead a normal life. Sports medicine or physical therapy is also an area that relates to this experiment. Either way, this project serves as a good match if any...

What is an atlatl? Learn how this Aztec dart throwing tool can be used to teach learners such things as distance, radius, and linear and angular velocity. Curriculum strands are provided for each of the many lesson plans for students...

In this lesson, students learn more about the characteristics of parallelograms by folding paper and measuring the angles in a parallelogram. Students use a ruler and protractor to draw parallelograms with given properties. Then,...

Manipulate variables and measure angles as light is refracted in this interactive simulation.

Accuracy of measurement in navigation depends very much on the situation. If a sailor's target is an island 200 km wide, sailing off center by 10 or 20 km is not a major problem. But, if the island were only 1 km wide, it would be missed...

Students use simple materials to design an open spectrograph so they can calculate the angle light is bent when it passes through a holographic diffraction grating. A holographic diffraction grating acts like a prism, showing the visual...

Find information on acute and chronic pain from symptom recognition to assessment and diagnosis to treatment and long-term outcomes. The information has come from many sources and has been adapted in collaboration with the Pain Centre at...

Accuracy of measurement in navigation depends very much on the situation. If a sailor's target is an island 200 km wide, sailing off center by 10 or 20 km is not a major problem. But, if the island were only 1 km wide, it would be missed...

The earliest explorers did not have computers or satellites to help them know their exact location. The most accurate tool developed was the sextant to determine latitude and longitude. In this activity, the sextant is introduced and...

Eighth graders are presented with a tile pattern showing an apparent square surrounded by four octagons. They are asked to answer a question about congruency and angle measurements, as well as prove that the interior shape is really a...

Given two triangles with some of their angle measures, determine whether the triangles are similar or not.