(3√2)²=3²+x²
9.2=9+x²
18-9=x²
9=x²
√9=x
3=x
(√10)²=3²+y²
10=9+y²
1=y²
√1=y
1=y
AB=x+y+CD=3+1+2=6cm
a=(B+b)h/2
a=(6+2)3/2
a=8.3/2
a=24/2
a=12cm²
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(3√2)²=3²+x²
9.2=9+x²
18-9=x²
9=x²
√9=x
3=x
(√10)²=3²+y²
10=9+y²
1=y²
√1=y
1=y
AB=x+y+CD=3+1+2=6cm
a=(B+b)h/2
a=(6+2)3/2
a=8.3/2
a=24/2
a=12cm²