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Interactive
Mangahigh

Mangahigh: Shape: The Angles Inside a Quadrilateral

For Students 5th - 8th Standards
Test your knowledge of the sum of angles inside a quadrilateral.
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Activity
Math Is Fun

Math Is Fun: Interior Angles of Polygons

For Students 3rd - 8th Standards
Learn what an interior angle of a polygon is and how you can calculate their value in triangles, quadrilaterals, and pentagons. Includes a chart that overviews the "general rule" for determining the sum of internal angles in any polygon...
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eBook
Math Planet

Math Planet: Geometry: Angles

For Students 9th - 10th Standards
Angles are explained through examples and a video lesson. [0:48]
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Activity
Texas Instruments

Texas Instruments: Measuring Angles in a Quadrilateral

For Teachers 9th - 10th Standards
In this activity, use an interactive, and investigative approach to determining the sum of the interior angles of a quadrilateral. They use Cabri Jr. to draw, measure, and calculate the characteristics of the angles of quadrilaterals.
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Interactive
National Council of Teachers of Mathematics

Nctm: Illuminations: Angle Sums

For Students 9th - 10th
Students may use this computer applet to explore angle sums of triangle, quadrilaterals, pentagons and hexagons.
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Interactive
Walter Fendt

Walter Fendt: Cyclic Quadrilateral (Inscribed Quadrilateral)

For Students 9th - 10th Standards
A short interactive activity which allows you to move the vertices of a quadrilateral to prove that the sum of the opposite angles is 180 degrees.
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Activity
Texas Instruments

Texas Instruments: Measuring Polygons an Introduction to Cabri Jr.

For Teachers 9th - 10th
This activity is designed as an introduction to using the Carbri Jr. application on the TI-83+/84+ calculators. Students are guided through the menu system and are shown how to draw triangles, quadrilaterals and and a pentagon. Perimeter...
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Lesson Plan
OER Commons

Oer Commons: Exploring Polygons

For Teachers 6th - 8th
In this lesson, students explore different polygons by drawing them, measuring angles, and manipulating interactive sketches to find the angle sum for any polygon. Students also explore the angle measures in regular polygons. Included...
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Activity
National Council of Teachers of Mathematics

The Math Forum: Problems Library Geometry Triangles

For Students 9th - 10th Standards
This site contains a wealth of problems that deal with the basic definitions of medians, altitudes, angle bisectors, and perpendicular bisectors or the defining characteristics of the different types of triangles. There are also...

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