The image above represents Poisson’s ratio.

To compute for Poisson’s ratio, two essential parameters are needed and these parameters are **lateral strain (ε _{l}) **and

**axial strain (ε**

_{a}).The formula for calculating Poisson’s ratio:

v = ^{εl} / _{ε}_{a}

Where:

v = Poisson’s Ratio

ε_{l} = Lateral Strain

ε_{a} = Axial Strain

Let’s solve an example;

Find the Poisson’s ratio when the lateral strain is 80 and the axial strain is 4.

This implies that;

ε_{l} = Lateral Strain = 80

ε_{a} = Axial Strain = 4

v = ^{εl} / _{ε}_{a}

v = ^{80} / _{4}

v = 20

Therefore, the **Poisson’s ratio **is **20.**

**Calculating the Lateral Strain when the Poisson’s Ratio and Axial Strain is Given.**

ε_{l} = v x ε_{a}

Where:

ε_{l} = Lateral Strain

v = Poisson’s Ratio

ε_{a} = Axial Strain

Let’s solve an example;

Find the lateral strain when the Poisson’s ratio is 40 and the axial strain is 9.

This implies that;

v = Poisson’s Ratio = 40

ε_{a} = Axial Strain = 9

ε_{l} = v x ε_{a}

ε_{l} = 40 x 9

ε_{l} = 360

Therefore, the **lateral strain **is **360.**

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