The Triangle

By Allen Reed, Douglas Jensen

Learners examine the properties of a triangle and work practice problems to find a triangle's perimeter and area.

The Trapezoid

In this interactive object, learners study the properties of a trapezoid and use a geometric formula to find its perimeter and area.

The Square

In this animated activity, learners read about the properties of a square and its components. They then work practice problems to find the perimeter and area of squares.

The Sphere

Learners study the properties of a sphere and use geometric formulas to find volume and surface area.

The Right Circular Cylinder

Learners study the properties of a right circular cylinder and use geometric formulas to find volume and surface area.

The Right Circular Cone

Learners study the properties of a right circular cone and use geometric formulas to find volume and surface area.

The Regular Square Pyramid

Learners study the properties of a regular square pyramid and use geometric formulas to find volume and surface area.

The Rectangular Solid

Learners study the properties of a rectangular solid and use geometric formulas to find volume and surface area.

The Rectangle

In this animated activity, learners read about the properties of a rectangle and its components. They then work practice problems to find the perimeter and area of rectangles.

The Parallelogram

In this animated activity, learners read the definition of a parallelogram and then find the perimeter and area of parallelograms in practice problems.

The Cube

Learners study the properties of a cube and use geometric formulas to find volume and surface area.

The Circle

By Douglas Jensen

In this animated and interactive object, learners examine the definitions and formulas for radius, diameter, circumference, and area. Students also solve practice problems involving the circumference and area of a circle.

Strength of Materials: The Centroid of a Triangle

By Steve Whitmoyer

In this animated and interactive object, learners calculate the area and centroid of a triangle.

Strength of Materials: The Centroid of a Circle

In this animated and interactive object, learners calculate the area and centroid of a circle.

Right Triangles That Are Special: Using the Pythagorean Theorem

By Michele Williams

In this learning activity you'll apply the Pythagorean Theorem to isosceles and equilateral triangles.

Pythagorean Theorem

In this learning activity you'll use the Pythagorean Theorem to calculate the lengths of the legs and hypotenuse of a right triangle.

Plotting Points on a Coordinate System

By Francine Nettesheim

In this learning activity you'll identify points on a coordinate system.

Labeling a Right Triangle

By Roy Peterson

In this learning activity you'll identify the sides of a right triangle with respect to the angles.