+
eBook
Math Planet

Math Planet: Geometry: Angles

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

Texas Instruments: Sum of Remote Interior Angles Equals Exterior Angle

For Teachers 9th - 10th
Draw a triangle with exterior angle. Measure the exterior angle and each remote interior angle. Use the Alpha hand to check that the sum of the remote interior angles is always equal to the exterior angle.
+
Activity
Texas Instruments

Texas Instruments: Extension: Parallel Lines and the Sum of the Angles

For Teachers 6th - 8th Standards
Students construct a line parallel to the base of a triangle and measure the angles formed. They use the construction to prove that the sum of the measures of the interior angles of a triangle is 180 degrees.
+
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g Find the Angle

For Teachers 8th Standards
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...
+
Activity
Texas Instruments

Texas Instruments: Sum of Interior Angles in a Triangle With Cabri Jr.

For Teachers 9th - 10th
Students will discover the sum of the interior angles in a triangle using the Cabri Jr. Application.
+
Unit Plan
CK-12 Foundation

Ck 12: Angle Measures

For Students 9th - 10th
[Free Registration/Login Required] Students explore the concept of finding triangle angle measurement by navigating through the interactive learning module and then answering questions that go along with the module. Students can also...
+
Unit Plan
CK-12 Foundation

Ck 12: Triangle Sum Theorem

For Students 6th - 9th
[Free Registration/Login Required] Students explore the concept of the triangle sum theorem by navigating through the interactive learning module and then answering questions that go along with the module. Students can also learn more...
+
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g.a Triangle's Interior Angles

For Teachers 8th Standards
In this task, 8th graders are presented with a drawing of two parallel lines with a triangle touching them at all three of its vertices. They are asked to prove that the sum of the triangles' angles equals 180 degrees. Aligns with 8.G.A.5.
+
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.g Find the Missing Angle

For Teachers 8th Standards
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.
+
Unit Plan
CK-12 Foundation

Ck 12: Triangle Sum Theorem

For Students 9th - 10th
[Free Registration/Login Required] Students explore the concept of the triangle sum theorem by navigating through the interactive learning module and then answering questions that go along with the module. Students can also learn more...
+
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Determining the Unknown Angle in a Triangle

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch a video and attempt practice problems on how to determine a missing angle in a triangle.
+
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Determine Unknown Angles: Isosceles, Scalene, Right Triangles

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch a video and attempt practice problems on finding the missing angles in triangles.
+
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Angle Measures in Given Triangles

For Students 6th
[Free Registration/Login may be required to access all resource tools.] Find the degree measure of an unknown angle in given triangles.
+
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...
+
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Determining Unknown Angles in Trapezoids

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch a video overview and attempt practice problems on finding the missing angles in a trapezoid.
+
Handout
Khan Academy

Khan Academy: Triangle Angles Review

For Students 9th - 10th Standards
Reviews the rule that the interior angles of a triangle always add up to 180 degrees. Includes three practice problems.
+
Unknown Type
Khan Academy

Khan Academy: Find Angles in Triangles

For Students 7th - 8th Standards
Find missing angle measures using the properties of triangles. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
+
Activity
Free Math Help

Free Math Help: Angles of a Triangle Sum

For Students 9th - 10th
The lesson discusses the angle-sum theorem. The resource consists of an explanation and practice problems with solutions.
+
Unit Plan
Khan Academy

Khan Academy: Equation Practice With Angle Addition

For Students 7th - 8th Standards
Given the sum of a pair of angles and the algebraic expressions that represent them, form and solve an equation. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
+
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...
+
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Third Angle Theorem Grades 8 10

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Apply the Third Angle Theorem.
+
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: A ced.a.1: Sum of Angles in a Polygon

For Teachers 9th - 10th
This problem provides students with an opportunity to discover algebraic structure in a geometric context. They will divide up polygons into triangles. The will use the sum of the angles of 180 degrees for each triangle. Aligns with...
+
Unknown Type
Khan Academy

Khan Academy: Angles of a Polygon

For Students 6th - 8th
Find the sum of interior angles of different polygons.
+
Activity
Texas Instruments

Texas Instruments: Exterior and Interior Angle Theorem

For Teachers 9th - 10th
In this activity, students investigate the relationship between the exterior angle of a triangle and its remote interior angles. They study the Triangle Sum Theorem and the Exterior Angle Theorem.

Other popular searches