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To make it easier, convert 7cm to m
1 m=100 cm
Now convert:
7 cm( \frac{1 m}{100 cm} )=0.07 m
Now the formula for the areA of the trapezoid is:
A=0.5(9 m)(5 m+0.07 m)
A=(4.5 m)(5.007 m)
A=22.5315 m

Hope this helps =)