Answer :

plot points A, B, C and D and join them as shown

Here quadrilateral ABCD so formed is a trapezium

Area of trapezium = 1/2 × (sum of parallel sides) × height

Here AB || DC

AB = 9 – 1 = 8 cm

CD = 7 – 3 = 4 cm

DG is the height of trapezium

DG = DF – GF

= 4 – 2

= 2 cm

DG = 2 cm

∴ Area of trapezium = 1/2 × (AB + CD) × DG

= 1/2 × (8 + 4) × 2

= 12 sq. cm

Area of trapezium ABCD = 12 sq. cm

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