l4,a4, S4 sunt latura, apotema și aria unui pătrat.
a) se dă R =8cm => diametrul=2R =2×8=16cm
latura=diametrul/√2=16√2/2=8√2cm => l4=8√2cm
apotema=l4/2=8√2/2=4√2cm => a4=4√2cm
S4=l4²=(8√2)²=64×2=128cm² => S4=128cm²
b) l4=6√2cm => 2R=(6√2)√2=12cm=> R4=6cm
apotema=l4/2=6√2/2=3√2cm => a4=3√2 cm
S4=l4²=(6√2)²=36×2=72cm²=> S4=72cm²
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