Billboard

Rectangular billboard is 2.5 m long with a diagonal 2.8 m long. Calculate the perimeter and the content area of the billboard.

Correct answer:

o =  7.5219 m
S =  3.1524 m²

Step-by-step explanation:

$$\begin{gathered} a=2.5 \\ u=2.8 \\ b=\sqrt{u^2-a^2}=\sqrt{2.8^2-2.5^2}\doteq 1.261 \\ o=2\cdot (a+b)=2\cdot (2.5+1.261)=7.5219\text{ m} \end{gathered}$$

$S=a\cdot b=2.5\cdot 1.261=3.1524{\text{m}}^2$

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