Q1 of 41 Page 230

The side of an equilateral triangle is shown by l. Express the perimeter of the equilateral triangle using l.

It is given in the question that,


Side of equilateral triangle = l


We know that,


Perimeter of equilateral triangle = Sum of all sides of the triangle


Therefore,


Perimeter of the equilateral triangle = l + l + l


= 3l


More from this chapter

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11

Look at the following matchstick pattern of squares (see figure). The squares are not separate. Two neighbouring squares have a common matchstick. Observe the pattern and find the rule that gives the number of matchsticks in terms of the number of squares.




 11

Figure gives a matchstick pattern of triangles. As in question 11 (a) above, find the general rule that gives the number of matchsticks in terms of the number of triangles.




 2

The side of a regular hexagon is denoted by l. Express the perimeter of the hexagon using l.

 3

A cube is a three-dimensional figure as shown in the adjoining figure. It has six faces and all of them are identical squares. The length of an edge of the cube is given by l. Find the formula for the total length of the edges of a cube.