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promień =4 cm
d= 2r= a√2
a√2=8
a=8 / √2
a=8√2 / √2√2
a=8√2 / 2
a=4√2
P=(4√2)²
P=16*2
P=32 cm²
r=4 cm
d=2r=a√2
a√2=8
a=8/√2
a=8√2/√2√2
a=8√2/2
a=4√2
P=(4√2)²
P=16*2
P=32 cm²
r=4 cm
to d=8 cm
P=1/2*d²
P=1/2*8²
P=1/2*64
P=32 cm²