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Sadieann,

1st use formula c^2=a^2 + b^2 - 2ab CosC to find length c

2nd once you know all 3 sides a,b,c then use formula

A=Square root of [ s (s-a) * (s-b)* (s-c) ]

where s = (a+b+c)/2

for 1st question. c = 20.18, s =25.09, area = 14.92 square unit.

you do the 2nd question