# Some vital tips to determine the quantity of steel bar for a triangular shape

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This civil engineering video tutorial will teach you how to determine the quantity of steel bar in meter or kg for a triangular shape.

The length of the triangular shape is taken as 4 meter and height is taken as 2 meter. The bars will be placed both to the direction of length and direction of height.

The diameter of the bars is 30 mm@500 c/c distance for both directions.

The lengths of the bars will be determined based on the angle of the triangular shape. In this purpose, the following formula will be used :-

tanθ = Opp /Adj (opposite /adjacent)

By putting the relevant values, we get the following result :-

θ = tan-1 = 2/4 = 26.565 degree

To determine the length horizontally, draw a line over it to form a small triangle.

Height is given as 500 mm or 0.5 meter and the value of length is unknown and it is taken as x.

Now, tan(26.565) = 0.5 / x

So, x = 0.5 / tan(26.565) = 1 meter

Now, the lengths to horizontal direction are gradually taken as L_{1}, L_{2} and L_{3}

So, L_{1} = 4 – 1 = 3 meter

### Also Read: How to work out the quantity of steel in beam

L_{2} = 3 – 1 = 2 meter

L_{3} = 2 – 1 = 1 meter

Therefore, total length = 3+2+1 = 6 meter

In order to find out the lengths of the bar in vertical directions, go through the following video tutorial.

Video Source: Engineering Tactics

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