Angle Sum Teacher Resources

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Find the Area of Triangles, Quadrilaterals, and Polygons (6.G.A.1)

For Teachers 6th - 8th Standards
Before diving into the formulas for area, show where the formulas connect to the shape of the figure. The four videos look at different shapes and by decomposing them, they end up relating directly to their area formula.
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Math Antics Geometry Video Lessons

For Teachers 4th - 8th Standards
The point of this collection of 12 videos is to introduce learners to three basic parts of geometry—points, lines, and planes. The presenter provides definitions, shows how to classify shapes, provides examples, and shows how to use...
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CORE Math Performance Assessment Modules: Grade 3

For Teachers 3rd Standards
Assess the math skills of third graders by casting them in the roles of cookie makers, data collectors, farmers, gardeners, delivery people, theatre attendees, muralists, and window washers. The nine CORE Math Performance Assessments in...
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Triangle Angle Sum

For Students 9th - 12th Standards
Don't believe everything that you hear — make them prove it! The video shows two methods to prove the Triangle Angle Sum Theorem. The following two videos apply the theorem to finding missing angle measures.
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Angle Sum of a Triangle

For Students 8th Standards
Prove the Angle Sum Theorem of a triangle using parallel line and transversal angle relationships. Pupils create a triangle from parallel lines and transversals. They find angle measures to show that the angles of a triangle must total...
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Angle Sum Property of Triangles

For Students 8th - 11th Standards
All triangles have some things in common. Using these properties of triangles, learners find missing angle measures. Scholars use the Angle Sum Property and properties of special triangles throughout the lesson.
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Polygon Angle Sum

For Students 9th - 12th Standards
Using patterns to build a formula is an important mathematical skill. Pupils discover a formula to find the sum of interior angles in a polygon by analyzing a pattern. The additional videos show how to use the formula to find various...
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Angle Sum of Triangles and Quadrilaterals

For Students 9th - 12th
In this angle sum worksheet, students find missing angles of 20 triangles and quadrilaterals.  Students find the missing angle in each polygon by using the total degrees of each and given angle measures.
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Lines of Symmetry for Quadrilaterals

For Teachers 3rd - 5th Standards
Explore how lines of symmetry help define different categories of quadrilaterals. Looking at a square, rectangle, trapezoid, and parallelogram, young mathematicians discover that each shape has its own, unique symmetry. Encourage your...
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Varieties of Quadrilaterals

For Teachers 4th - 7th
Students classify quadrilaterals, In this quadrilaterals lesson, students watch a video about parallelograms, discuss the different types of quadrilaterals, and complete a worksheet classifying quadrilaterals.
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Inscribed Quadrilaterals in Circles: Lesson

For Students 9th - 11th Standards
Find supplementary information about inscribed angles. A section of a large geometry playlist introduces the relationship of angles in an inscribed quadrilateral. The presentation works through examples that use the relationship between...
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Midpoint Quadrilaterals

For Teachers 9th - 10th
The quadrilateral is a very interesting shape. Have your class construct midpoint quadrilaterals within quadrilaterals on their Ti-Nspire. They measure the length and angle measures of sides and angles of the midpoint quadrilateral. Full...
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Create, Classify, and Sort Quadrilaterals

For Teachers 4th Standards
Quadrilaterals can be quirky! Fourth graders use geoboards and bands to create four-sided figures. They analyze the attributes such as angle size and presence of parallel sides. As a result they learn to differentiate among rectangles,...
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Quadrilaterals and Angle Sums - Homework 14.6

For Students 4th - 7th
For this quadrilaterals and angle measure worksheet, students classify figures, find missing angle measures, and draw quadrilaterals according to specifications. Students solve ten problems.
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Quadrilaterals and Angle Sums - ELL 14.6

For Students 4th - 6th
In this identifying quadrilaterals and angles true and false worksheet, students review sides and angles of a quadrilateral, parallelogram, trapezoid, rectangle, rhombus, and square and write true and false answers to statements....
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Names of Quadrilaterals

For Students 4th - 8th Standards
They've all got four sides, but some have more interesting properties. Scholars learn the names of quadrilaterals. They also explore some properties of these quadrilaterals, including congruent angles, congruent and parallel sides, and...
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Naming Quadrilaterals

For Students 3rd
Scholars examine six common quadrilaterals and identify each by writing its name beneath the shape. Next, they sketch four shapes: parallelogram, rectangle, rhombus, and trapezoid. Once finished, review which features helped learners...
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Areas of Quadrilaterals and Triangles

For Students 6th - 8th
Here is an area of quadrilaterals and triangles worksheet in which learners solve five short answer problems. They find the area of rectangles, parallelograms, squares, triangles, and trapezoids given a word problem or sketch of the figure.
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For Students 9th - 12th Standards
Connect the quadrilaterals. Working in teams, pupils use a variety of tasks to make connections between special quadrilaterals. With the properties well defined, the groups construct quadrilaterals based on those properties. Learners...
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For Students 5th - 6th
In this solving quadrilateral word problems worksheet, students draw figures to identify quadrilaterals, use angles to find the ones missing, and explain classification. Students solve six problems.
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Polygon Angle-Sum Theorem

For Teachers 10th
Tenth graders investigate the sum of the measurements of the angles of a polygon. In this geometry lesson, 10th graders use Cabri Jr. to examine the sum of the measurements of the angles of a polygon. The dynamic nature of Cabri Jr....
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Angle Sum and Difference

For Students 11th
In this angle sum and difference worksheet, 11th graders solve 10 different problems related to determining the angle sum and difference of numbers. First, they determine the exact value of sine and cosine degrees. Then, students utilize...
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Practice 3-4 Parallel Lines and the Triangle Angle-Sum Theorem

For Students 9th - 11th
For this parallel lines worksheet, students use the triangle angle-sum theorem to determine the value of given angles within or adjacent to triangles. This one-page worksheet contains 20 problems.
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Quadrilateral Sort

For Teachers 7th
If only you had a Sorting Hat to sort out quadrilaterals. Learners sort cutouts of quadrilaterals based on their properties and attributes. A flowchart helps them organize the results of the activity.

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