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P= 1/2*a*h
200=1/2*a*10\/2 /*2
400=a*10\/2 /: \/2
400/\/2= 10a/:10
a=20\/2
P=10\/6
d1=4\/3
P=1/2*d1*d2
d2=5\/18 przez 3
p troj.=a*1/2*h=200
a*1/2*10√2=200
a*5√2=200
a=200/5√2
a=40/√2
a=20√2
2)
pole rombu =d1*d2/2 d1,d2-przek
4√3*d2/2=10√6
4√3d2=10√6
d2=20√6/4√3=5√6/√3=5√18/3=15√2/3=5√2