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a:b =16:9
a=16x
16x=80
x=80:16
x=5cm
b=9x
b=9*5=45cm
d²=a²+b²
d²=80²+45²=6400+2025=8425
d=√8425
d=91,79 cm dł. przekątnej
1cal=2,48cm
91,79:2,48 =37,01cal
telewizor 37 cali