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przekątną obliczamy ze wzoru: d=a√2
a√2=4
a=4/√2
a=2√2
pole kwadratu P=a²=(2√2)²=8 cm²
zad.2:
12:3=4
e=4cm
f=8cm
P=e*f/2=4*8/2=16cm²
a=4/{2*{2/{2
a=2{2
P=a*a
P=(2{2)*(2{2)
P=8cm2
2
a+2a=12
3a=12/3
a=4
2a=8
P=1/2 d1*d2
P=1/2*4*8
P=16cm2