REDRUM

Sin^-1 W/L

W=8 L=9 > 90 degrees
W= 7 L=7 > 90 degrees
W= 14cm L=23cm > 37.5 degrees
W=9 L=9 > 90 degrees
W=10 cm L=25cm > 23.6 degrees
W=11cm L=20cm>33.4 degrees

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