Question

1) m(∠A)=90°grade
DC=6cm
CB=8cm
m(∠ABCD)=30°grade
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Aria trap ABCD=?

2)

Answer 1

1/x*2-x+1/x=1
1/x*2-x+1/x=1 unde x≠0
1/2x-x+1/x=1
1/x+1/x=1
2/x=1
2=x
x=2
unde x≠0