A dodecagon is a two-dimensional shape with 12 sides. A regular-shaped dodecagon has all its sides with the same length, and all internal angles are the same size. An irregular-shaped dodecagon has sides and angles of different sizes.
Know MoreA dodecagon also has 12 vertices and 12 internal angles at each one of those vertices. The internal angle in a regular dodecagon is 150 degrees, making the total sum of angles 1,800 degrees. Many historic buildings have been built in the shape of a dodecagon, including the Vera Cruz church in Segovia, Spain, and the Torre del Oro, a 13th century military watchtower in Seville, Spain.
Learn more in ShapesTo make a four-sided pyramid out of cardboard, simply attach four triangles to the sides of a square, and then fold the triangles up and secure them at the apex. Lay all the pieces out and tape them together, and fold them together as the final step.
Full Answer >The perimeter of a triangle is the sum of all the sides of the triangle, and you determine the perimeter of any triangle by adding the lengths of all three sides. Since an isosceles triangle has two sides of equal length, start by multiplying the length of one of the equal sides by two. Then, add the product to the length of the base side. The resulting sum is the perimeter of the triangle. Using either a pen and paper or a calculator, you can make these simple calculations in just a few minutes.
Full Answer >The triangle is the strongest shape due to the rigidity of its sides, which allows them to transfer force more evenly through their sides than other shapes. Triangles are used extensively in the construction of buildings and bridges.
Full Answer >The formula for finding perimeter is to add up the lengths of all sides of the object. If the object is a circle, then the radius is used to find the perimeter. The word perimeter originates from the Greek word peri which means around and meter which means measure.
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