What is perimeter? Learn the perimeter definition in math and geometry, and learn how to calculate the perimeter of different shapes, with examples.

Learn how to find the perimeter from the area of a given shape. Understand the stepwise method of calculations for some common shapes like square, rectangle, circle, and triangle.

Learn how to find the perimeter of polygons in this engaging video lesson. Watch now and understand the concepts behind perimeter calculations, then take a quiz.

Learn the formula to find the perimeter of a rectangle. Explore examples of how to calculate a rectangle's perimeter.

The perimeter of the circle is given by the product of the diameter (2r) by the irrational number π, which is approximately 3.14. What is the perimeter of a certain sector of a circle?

Learn about perimeter, how to use mathematical formulas to calculate the perimeter of triangles and rectangles, and how to use perimeter to determine the length of unknown polygon sides.

Learn about the perimeter and area of a square. This involves the relationship between the area and perimeter of a square and the area of a square formula.

The perimeter of a geometric object is the line that delimits its closed region. In particular, the perimeter of a trapezoid is the sum of the measurements of all of its sides.

What is a semicircle? Learn the area of a semicircle formula and perimeter of a semicircle formula. See worked examples of how to find area and...

Learn what a composite figure is with real-life examples. Understand how to find the perimeter, area, and volume of a composite figure through solved examples.