Answer
$3.4$ meters of yarn
Work Step by Step
We convert 85 cm to meters (100 cm=1 meter):
$\displaystyle 85~cm*\frac{1~m}{100~cm}=0.85~m$
A square-shaped pillow will have 4 corners, so she will need 4 tassels:
$4*0.85=3.4$ meters of yarn
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