Square

Calculate the perimeter and the area of square with a diagonal length 30 cm.

Correct answer:

o =  84.8528 cm
S =  450 cm²

Step-by-step explanation:

$$\begin{gathered} u=30 \\ a=u\mathrm{/}\sqrt{2}=30\mathrm{/}\sqrt{2}=15\sqrt{2}\doteq 21.2132 \\ o=4a=4\cdot 21.2132=60\sqrt{2}=84.8528\text{ cm} \end{gathered}$$

$S=a^2=21.2132^2=450{\text{cm}}^2$

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