Math is an important part of our everyday lives. Math lies in the various shapes, sizes, weights distances, etc that we see around us. Shapes(Polygons) are of different types – square, triangle, rectangle, pentagon, etc. Today, we are going to discuss triangles. Before we define a triangle, it’s important to understand what a closed figure is. A closed figure is one that is connected on all sides. A triangle is such a closed figure that has three sides.

**Now for some Triangle Trivia:**

- Did you know that triangles can be classified either by angle measurements(Acute, Right and Obtuse) or by side lengths(Equilateral, Isosceles and Scalene)?
- Did you know that the corners of a triangle are called Vertices of the triangle?
- Did you know that Degree is a unit for measuring angles and that the sum of all angles in a triangle is always 180 degrees?
- An Acute Triangle is one in which each of the three angles is acute – less than 90 degrees.
- A Right Triangle is one in which has one right angle – 90degrees.
- An Obtuse Triangle is defined as a triangle that has one obtuse angle – more than 90 degrees.
- An Equilateral Triangle, as the name suggests, is one in which all the three sides are of the same length(congruent)
- An Isosceles Triangle is a triangle in which at least 2 sides are of the same length(congruent).
- A Scalene Triangle is one in which all sides are of different lengths.
- Did you know that an Equiangular triangle is one in which each of the angles measures exactly 60 degrees and the lengths are also the same? Thus, an equiangular triangle is an acute triangle(less then 90 degrees) and also an equilateral triangle.
- So, we now know that all triangles have: 3 sides, 3 angles and 180 degrees.
- Did you know that
- Did you know that the longest side of a right angle triangle is called hypotenuse? The hypotenuse is always opposite the right angle.
- Did you know that Trigonometry is the study of the relationship between the angles of triangles and their sides?
- Did you know that the Pythagorean Theorem is one of the most important features of right angle triangles? We can find out the length of the longest side of the triangle if the lengths of the other two sides are known. It is based on the fact that the square of the longest side is the sum of the squares of the other two sides.
- Did you know that all world famous bridges(and all the not-so-famous ones, too!), the Eiffel Tower, the Egyptian Pyramids and the Disney Epcot Center Dome are all examples of the use of triangles in our daily life? That’s because triangles help keep the buildings the strongest.
- Did you know that any polygon can be made stronger by adding triangles to it? That’s the reason why engineers use triangles in almost all of their constructions. Without triangles, a design would turn up to be much weaker or at times even impossible to build!
- Did you notice the other applications of triangles in our daily lives? The ‘YIELD’ sign, the musical instrument – Triangle, the rack that is used to arrange the balls on a billiards table, rooftops, the Indian savory Samosa, a Tripod stand are all examples of triangles that we see in the real world.
- Did you know that Pascal’s Triangle got its name from the famous French mathematician and philosopher Blaise Pascal, who formulated the Treatise on the Arithmetic Triangle?
- Have you heard of the Bermuda Triangle??? It is a region in the western part of the North Atlantic Ocean, in which, allegedly, people, planes and ships have disappeared mysteriously.

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