In this triangles worksheet, 10th graders solve and complete 22 different problems related to various types of triangles. First, they name the shortest and longest sides and the smallest and largest angles in each of triangles...

In this right triangles worksheet, 10th graders solve and complete 12 various types of problems. First, they solve for x given each of the right triangles shown. Then, students determine the length of the shorter diagonal given the...

For this centroid of triangles learning exercise, students use given information to determine the centroid of a triangle. They identify the point through which all medians of the triangle pass. This five-page learning exercise contains...

Students identify different parts of a triangle. In this geometry lesson, students differentiate between similar and congruent triangles. They use the navigator to crate a visual of the different parts of a triangle.

In this congruent triangles and rectangles worksheet, students solve 6 word problems where they identify whether triangles and rectangles are congruent, and construct triangles. Students must explain their reasoning and prove each answer.

In this triangles worksheet, learners solve six word problems where they determine the angles measures in different triangles.

In this triangles worksheet, students identify the median, altitude, segment, angle bisector, perpendicular bisector and triangle midsegment of triangles.  They find the perimeter of triangles.  This three-page worksheet...

In this geometry instructional activity, students solve problems based on the triangle inequality theorem(s) in which determine if the given lengths can form a triangle, given two sides of a triangle determine the range of the third...

For this area of a triangle worksheet, students solve 6 graphing problems. Students find the area of a triangle given the three coordinates of the vertices.

In this right triangles instructional activity, 10th graders solve and complete 13 different problems. First, they find the lengths of both missing sides. Then, students find the altitude of an equilateral triangle given the measure of...

In this angular size and similar triangles instructional activity, students use the properties of similar triangles and the ratios of sides to solve for unknowns in given diagrams.

Students classify angles. In this angles lesson, students explore the characteristics of angles, triangles, quadrilaterals and circles. They identify polygons and sing a classifying angles song. Students participate in a manipulative...

Seventh graders recognize the characteristics of isosceles triangles. For this isosceles triangle lesson, 7th graders use geoboards to create isosceles triangles. Students record results and explain why they have an isosceles triangle.

Young scholars explore what the Bermuda triangle is and the theories as to why it is so mysterious.  In this mystery lesson students read and discuss the history and the mystery behind the Bermuda Triangle. 

Students use similar triangles to find missing heights.  In this using similar triangles to find missing heights lesson, students use proportions to find the heights of missing side lengths.  Students find the height of trees...

Students prove and apply theorems of triangle inequality and hinge theorem. In this geometry lesson plan, students will discuss which triangle is bigger and why. They will use theorems, such as Exterior Angle Inequality or the...

In this right triangles instructional activity, 10th graders solve 10 different problems that include various right triangles. First, they find the value of a base given its hypotenuse. Then, students determine an angle given the...

For this area worksheet, students read and problem solve the area of 8 triangles. Students show their work on each problem on the worksheet.

In this area of triangles learning exercise, students solve 18 area of triangles problems.  Students find the area of various types of triangles given a graph of the triangle.

In this triangle worksheet, students solve 1 word problem about the lengths of a triangle. Students determine the length of the longest side given the ratio of the angle measures.

In this special right triangles instructional activity, students solve 15 short answer problems. Students use trigonometric functions to find missing side lengths of various right triangles.

Fifth graders investigate growth patterns using blocks. In this square and triangle numbers lesson, 5th graders predict sizes of larger triangles and squares based on numerical patterns they observed while building. 

Young scholars investigate the Napoleon triangle theory. In this polygon activity, students  differentiate between the boundary points, interior and lattice point of a polygon. They apply concepts of equilateral triangles to...

Students identify the special segments of triangles, the median, angle bisector, altitude, and perpendicular bisectors.