A triangle have three edges and three vertices. A triangle is a basic shape in geometry.

In this chapter we will cover the following topics related to triangle.

-Similar figures

A similar figures have a same shape but a similar figures not have a same size. In geometry a two circle are similar, two squares are similar etc.

-Similarity of triangles

A similar triangle have two triangles are said to be similar if their corresponding angles are equal and their corresponding sides are proportional.

-Criteria for similarity of triangles

-Area of similar triangles

-Pythagoras

In a right triangle the square of the hypotenuse is equal to the sum of the square of the other two side.

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