Railing 3

A railing in a museum is filled with 18 glass plates in the shape of a parallelogram with a side length of 40cm and a corresponding height of 65cm. How many m² of glass were needed to produce these fillings?

Correct answer:

S =  4.68 m²

Step-by-step explanation:

$$\begin{gathered} n=18 \\ a=40\text{cm}\to \text{m}=40:100\text{m}=0.4\text{m} \\ v=65\text{cm}\to \text{m}=65:100\text{m}=0.65\text{m} \\ {S}_1=a\cdot v=0.4\cdot 0.65=\frac{13}{50}=0.26{\text{m}}^2 \\ S=n\cdot S_1=18\cdot 0.26=4.68{\text{m}}^2 \end{gathered}$$

Try another example