please help me i dont get it

label Mathematics
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May 7th, 2015

18. the half of the other diagonal is  3*tan60 = 3*sqrt(3) 

thus the area is 4*3*3sqrt(3)/2 = 18sqrt(3)

19. the ratio is 2*(3+9)/[2*(5+11)] = 12/16 = 3/4 

May 7th, 2015

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May 7th, 2015
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May 7th, 2015
Jun 22nd, 2017
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