Triangle, Kala Bakra

INTRODUCTION OF TRIANGLE Triangle (geometry), geometric figure consisting of three points, called vertices, connected by three sides. In Euclidean plane geometry, the sides are straight line segments . In spherical geometry, the sides are arcs of great circles . Geometry; Trigonometry. The term triangle is sometimes used to describe a geometric figure having three vertices and sides that are arbitrary curves.

Triangles are classified in terms of their sides and angles. Scalene triangles have no equal sides.

Isosceles triangles have two equal sides.

A line is called an altitude if it is drawn from a vertex perpendicular to the opposite side.

In obtuse triangles, one angle is more than 90°

A triangle drawn on the surface of a sphere is called a spherical triangle

In right triangles, one angle is equal to 90°

In this triangle each side is 60 degrees and sides are equels.