2.2 Triangles
Types Properties of Triangles • Perimeter Area • Hero’s Formula • Pythagorean Theorem • Similar Triangles
When part of a plane is bounded closed by straight-line segments, it is called a polygon, it is named according to the number of sides it has. A triangle has three sides, a quadrilateral has four sides, a pentagon has five sides, a hexagon has six sides, so on. The most important polygons are the triangle, which we consider in this section, the quadrilateral, which we study in the next section.
TYPES PROPERTIES OF TRIANGLES
In a scalene triangle, no two sides are equal in length. In an isosceles triangle, two of the ...
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