Explore geometric solids and their properties with these interactive tools, beginning with an introduction to the faces of basic polyhedra; counting the number of faces, edges, and corners (vertices) in various solids; discovering Euler's Formula; constructing physical models of geometric solids; and identifying which geometric solids can be made from given nets.
This course is oriented toward US high school students. Its structure and materials are aligned to the US Common Core Standards. Foci include: formulas for calculating the volume of prisms, cylinders, pyramids, cones, and spheres; and assist you in using geometric modeling to solve problems involving three-dimensional figures.
Geometry is concerned with the various aspects of size, shape and space. In this unit, you will explore the concepts of angles, shapes, symmetry, area and volume through interactive activities.
This geometry lesson demonstrates how to find the area of a rhombus from circumradii of triangles.
This geometry lesson gives a few more 45-45-90 triangle examples and introduces the properties of 30-60-90 triangles.
This geometry lesson solves problems that determine the length of sides for 30-60-90 triangles.
This geometry lesson gives properties of 45-45-90 triangles and shows how to determine the lengths of their unshared sides.
This geometry lesson introduces and defines acute, obtuse and right angles.
This geometry lesson discusses parallel lines and the relationship of angles that form when other lines, called transversals, cross them.
This geometry lesson continues the discussion of parallel lines and the relationship of corresponding angles that form when other lines, called transversals, cross them.
This geometry lesson discusses how to determine the area of rectangles and triangles, as well as how to find the perimeter of a rectangle.
This geometry lesson shows that the area of diagonal generated triangles of a rectangle are equal.
This geometry lesson demonstrates how to calculate the area of an equilateral triangle inscribed in a circle and uses a little trigonometry.
This geometry lesson shows how to calculate the area of a circle and discusses how pi is calculated and used in the formula.
This geometry lesson discusses the properties of a circle and defines the ideas of radius, diameter and circumference.
This geometry lesson shows how to find the volume and surface area of a cylinder.
This geometry lesson shows how to use Heron's Formula to determine the area of a triangle while only knowing the lengths of the sides.
This geometry lesson explains an angle, angles in a circle, and complementary and supplementary angles. [Geometry playlist: Lesson 1 of 31]
This geometry lesson extends on the concepts of complementary and supplementary angles and provides an introduction to opposite angles.
