Discusses the properties and types of triangles, explaining that a triangle is a closed figure with three sides and angles. It categorizes triangles into equilateral, isosceles, scalene, obtuse, right ...

To start, all polygons can be divided into a number of triangles. This is useful because of the fact that the interior angles of any triangle add up to 180 degrees. The sum of the interior angles ...

Interior angles in a triangle add up to 180˚. Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles. Interior angles in a triangle sum to ...

To find the sum of interior angles in a polygon divide the polygon into triangles. The sum of interior angles in a triangle is 180°. To find the sum of interior angles of a polygon, multiply the ...

The sum of the angles inside any polygon can be found by spitting the polygon into triangles. Consider any triangle. The sum of the angles is known to be 180° A quadrilateral can be split into ...

These shapes are all regular polygons. A regular triangle is called an equilateral triangle. A regular quadrilateral is called a square. Irregular polygons are shapes that have sides and angles of ...

That’s why you then multiply by 180° - that’s the sum of the internal angles within a triangle. Here's how you would change the formula for the different polygons below. You can even try ...