Angle Sum Teacher Resources

If you add the value of the three interior angles in a triangle will it equal 180 degrees? Yes it will. The instructor illustrates and proves the Triangle Sum Theorem. Follow closely as she explains her proof.

A rectangle, a rhombus, a square, a trapezoid - are any of these a parallelogram? What are the criteria that make a shape a parallelogram? It has something to do with parallel sides, congruent sides, and congruent angles. Help your young...

In this gradient instructional activity, students draw line segments and determine if they are parallel. They plot points on a coordinate plane and calculate the gradient of each created line. This five-page instructional activity...

Build on your learners' previous knowledge of geometric shapes and symmetrical figures. Then set them out to take photos of geometric shapes on campus. They assess whether the photos contain symmetry or not. 

Students differentiate between inscribed quadrilaterals and parallelograms. In this geometry lesson plan, students identify the shaped of the polygons when it is inscribed inside of a circle. They calculate the missing angles of the...

Learners use construction technology to identify and find relationships between the attributes of various quadrilaterals. They make and test conjectures about the distinguishing properties of parallelograms, rectangles, rhombuses,...

In this classifying shapes using Venn diagrams worksheet, students draw examples of isosceles, right, and equilateral triangles in the proper sections of the first graphic organizer. They draw polygons, both regular and quadrilaterals,...

In this angles worksheet, students calculate the size of angles, draw lines of symmetry, and form quadrilaterals in four exercise sets.  The solutions are provided.

For this identify geometric shapes worksheet, students identify eleven shapes as either triangles, nonagons or quadrilaterals.

In this geometry worksheet, 10th graders determine the area and perimeters of various quadrilaterals and triangles.  The one page worksheet contains ten problems.  Answers are not provided. 

In this geometry worksheet, 10th graders match basic vocabulary words relating to angles, circles, quadrilaterals, and transformations in a drag and drop game format.  The one page interactive worksheet contains twenty matching...

For this math worksheet, students read an informative chart about how to find the area of quadrilaterals. Students then answer 6 questions in which the area of quadrilaterals is calculated.

Logical thinking is at the forefront of this jam-packed lesson, with young mathematicians not only investigating geometric concepts but also how they "know what they know". Through each activity and worksheet, learners wrestle with...

Storm into a better understanding of geometry. Using a tornado as a backdrop, scholars practice their skills finding perimeters and areas of rectangles. Learners apply their knowledge of the Pythagorean Theorem to find missing sides of...

After a tornado, an insurance company is in need of finding the area of a plot of land. Pupils use their knowledge of trapezoids and area formulas to calculate the area of the plot of land. The scholars work in groups to justify the...

They say real estate is location, it might be more about area. Learners work individually and in groups to design subdivisions by dividing the land up into lots. Scholars design floor plans to fit on the lots along with including a park....

Using a TI Navigator to drag quadrilaterals around to create different shapes, students learn how to draw midpoints in their quadrilaterals. In this geometry instructional activity, students solve problems using the properties of...

Eighth graders find missing angles of triangles, quadrilaterals and angles formed by parallel lines cut by a transversal. They use area formulas to find the area of a figure; find the complement and supplement of a given angle; and know...

For this recognizing characteristics of shapes worksheet, students identify characteristics of quadrilaterals, triangles, and parallelograms and determine which sets fall under the same category. Students solve four problems.

Pupils identify the properties of different polygons. In this geometry activity, students find the slope of a line and calculate the distance between two lines. They differentiate between similar and congruent polygons.

Guide your geometers through the process of constructing polygons. They learn how to draw triangles, squares, parallelograms, rectangles, rhombuses, and trapezoids with specified angles using a protractor and a ruler. The lesson plan...

Learners solve and complete four various types of problems. First, they show on the diagram why the area of a triangle is given by a formula. Then, pupils find the area of each triangle and parallelogram illustrated, They also circle the...

In this polygons worksheet, 7th graders identify and complete 8 different problems that include determining the types of various polygons. First, they use the table to the left to color each of the polygons illustrated. Then, students...

In this symmetry worksheet, 7th graders identify and complete 12 different lines of symmetry in polygons. First, they color all of the polygons that have a line of symmetry. Then, students circle all of the regular polygons and use the...