a)
[tex]8^2+15^2=a^2\\64+225=a^2\\289=a^2\\a=\sqrt{289}=17\\Ob=4a\\Ob=4*17cm=68cm\\\\e=16cm\\f=30cm\\P=\frac{e*f}{2}\\P=\frac{16cm*30cm}{2}=8cm*30cm=240cm^2[/tex]
b)
[tex]a = 10cm\\b = a\sqrt2\\b = 10\sqrt2cm\\Ob=2a+2b\\Ob=2*10cm+2*10\sqrt2cm=20cm+20\sqrt2cm=(20+20\sqrt2)cm\\a=h\\P=bh\\P=10\sqrt2cm*10cm=100\sqrt2cm^2[/tex]
c)
Nie widac dobrze wymiarow.
