# Geometry: Shapes and Formulas

The following videos will describe the common geometrical shapes and the formulas to calculate their area and perimeter. The videos also include the use of the Pythagorean Theorem and Heron's formula.

The following diagram shows the Geometry Formulas for perimeter, circumference, area, surface area, and volume. Scroll down the page for more examples and solutions using the geometry formulas.

Perimeter and area of triangles, rectangles, and trapezoids Area of triangles including Heron's Formula. Pythagorean Theorem. Area and circumference of circle Surface Area of Circular Solids (cylinders, cones, spheres)

Area and Circumference of circle. Solve word problems involving perimeter, area and right triangles
A lesson on the basic formulas of geometry, including area and perimeter of rectangles, squares, circles and triangles

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