The sides 3

The sides of an equilateral triangle are 9.4 cm, correct to the nearest one decimal place.
Work out the upper bound of the side of this triangle.

Correct result:

a₂ =  9.45 cm

Solution:

$$\begin{gathered} a_1=9.4\text{ cm } \\ {a}_2=a_1+0.05=9.4+0.05={\displaystyle \frac{189}{20}}={\displaystyle \frac{189}{20}}\text{ cm}=9.45\text{ cm} \end{gathered}$$

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