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zad2
a) 9cm^2+40cm^2=d^2
81cm+1600cm=d^2
pieriwastek ze 1681=pierwiastek z d^2
41cm=d
d-przekatna
b) 5cm^2+12cm^2=d^2
25cm+144cm=d^2
pierwiastek ze 169cm = pierwiastek ze d^2
d=13cm
d^2-d do potegi drugiej
a²+b²=c²
1)
z²=15²-12²
z²=225-144
z²=81
z=9
2)
4dm=40cm
x²=40²+9²
x²=1600+81
x²=1681
x=41
1,2dm=12cm
x²=12²+5²
x²=144+25
x²=169
x=13