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4x=42/4
x=10,5
4/8=7/y
4y=56/4
y=14
Obw=7+14+10,5=31,5
|BC|=4cm
|AC|=8cm
k=?
k=⁴/₇
|A'B'|= ⁴/₇=⁶/x
|A'B'|=10,5 cm
|A'C'|= ⁴/₇=⁸/x
|A'C'|=14 cm
Obw. 10,5+7+14 = 31,5 cm
mam nadzieję, że pomogłam ;)