0,5d = 5 |:0,5
d = 10
x²+8² = 10²
x²+64 = 100
x² = 100-64
x² = 36
x = √36
x = 6
P = 8*6
P = 48 cm²
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0,5d = 5 |:0,5
d = 10
x²+8² = 10²
x²+64 = 100
x² = 100-64
x² = 36
x = √36
x = 6
P = 8*6
P = 48 cm²
i teraz z pitagorasa
a2+b2=c2
a=8cm
b=?
c=10cm
10*10 - 8*8 =x*x
100-64=x*x
36=x*x
x=6
Pole prostokąta = a*b
a=8cm
b=6cm
P=6*8
P=48cm2