Answer:
Step-by-step explanation:
corner points are A(3,8),B(8,3),C(11,6),D(6,11)
AB=√((8-3)²+(3-8)²)=√(25+25)=√50=5√2
BC=√((11-8)²+(6-3)²)=√(9+9)=√18=3√2
CD=√((6-11)²+(11-6)²)=√(25+25)=√50=5√2
DA=√((3-6)²+(8-11)²)=√(9+9)=√18=3√2
area=length× width=5√2×3√2=15×2=30 sq units
