Square

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

Result

o =  84.853 cm
S =  450 cm2

Solution:

$u=30 \ \\ a=u / \sqrt{ 2 }=30 / \sqrt{ 2 } \doteq 15 \ \sqrt{ 2 } \doteq 21.2132 \ \\ o=4a=4 \cdot \ 21.2132 \doteq 60 \ \sqrt{ 2 } \doteq 84.8528 \doteq 84.853 \ \text{cm}$
$S=a^2=21.2132^2=450 \ \text{cm}^2$

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