Question 294654
Hello, 
There are 2 possible answers, depending on how the 30-60-90 triangle is set in the parallelogram.  
Since we know the area is equal to base times height, the height is found by the 30-60-90 formula. It's either 10 cm or 10 sqrt3 cm
So if the height is 10 the area would be:
300 sq cm or 
300 sqrt3
RJ
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