![]() ![]() We use the symbol ∆ to denote a triangle. It is a polygon with three corners, three vertices, and three angles joined together that forms a closed diagram. What is a Triangle?Ī triangle is a two-dimensional closed figure with 3 sides. This article will discuss the meaning of a triangle, the different types of triangles and their properties, and their real-life applications. Eratosthenes (276 BC – 195 BC), again, used the same method to determine the distance around the surface of Earth (called circumference). Miletus (624 BC – 547 BC), a Greek mathematician, adopted Egypt’s geometry and was brought to Greece.Īristarchus (310 BC – 250 BC), a Greek mathematician, used the above method to find the distance between the Earth and the Moon. It is a perfectly engineered model that its lengths and angles on all sides are the same. Its shape is actually that of a 3D pyramid, which has triangular faces. The Egyptians created the pyramids around 2900 B.C. ![]() Then they used to apply the law of sines for calculating the required distance. They measure the distance from two different locations, then measure the angle created by shift or parallax, formed by the observer’s movement between the two locations. The word triangle is taken from the Latin word ‘triangulus,’ which means three-cornered.ĭuring ancient times, astronomers had created a method called triangulation to determine the distances of the distant stars. In simple words, a triangle is a polygon with 3 sides. In Geometry, a triangle is the most important shape, defined as a closed two-dimensional diagram containing 3 sides, 3 angles, and 3 vertices. Types of Triangles – Explanation & Examples ![]()
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