sina = 7/25
a = asin(7/25)°
tan(asin(7/25)) = b/25
b = 7.29166666667 cm.
c = 25-7.29166666667
c = 17.70833333333 cm.
cos(asin(7/25)) = 25/d
d = 25.96150997149 cm.
(7/25) = e/17.70833333333
e = 4.95833333333 cm.
It implies;
DF = e+d
DF = 4.95833333333+25.96150997149
DF = 30.91984330482 cm.
DF ≈ 31 cm to the nearest whole number.
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