Diagonal meaning and definition explained

Learn and know the diagonal meaning in math especially in geometry. In geometry while studying about squares, rectangles we learnt that they have two diagonals. And also we will draw the diagonals and name it. Do you know what is the diagonal meaning? Which is shown on squares or rectangles or in any quadrilateral? By the line segments.

Diagonal meaning and definition explained

All the different types of polygons will have some diagonals except the triangle because for a triangle we cannot draw the diagonals that you can understand by seeing the definition of the diagonal. So from this it is clear that a triangle does not have any diagonals i.e. the number of diagonals for a triangle is “0”. For finding the number of diagonals for a polygon we have a formula. So if you want to know the number of diagonals for any polygon use the formula and find it. After finding if it is necessary you can show all the diagonals without missing any diagonals. We know how to find number of diagonals, now we will know diagonal meaning and also its definition.

The diagonal meaning as follows:

The definition or the meaning of the diagonal is “The line segment formed by joining any two vertices of a polygon except adjacent vertices is called as a diagonal”.


We have understood diagonal meaning and definition. Now we will see how to draw them. Let us consider a pentagon PQRST as shown in the above figure. According to the formula of number of diagonals of a polygon, a pentagon will have 5 diagonals. In that we will see how to draw the some diagonals. Start from vertex P. Adjacent vertices we should not take. So join PR, we get one line segment called diagonal, so PR is one diagonal. If we take vertex Q, the adjacent vertices we should leave then remaining vertices we can consider. So join QS, it is a diagonal. Next from vertex T, Join TR, it is also one of the diagonal. Remaining you complete it. Totally we get 5 diagonals.

Hope that everything you have known about diagonals i.e. diagonal meaning, number of diagonals, representing diagonals.

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